56 files changed, 162 insertions, 224 deletions
diff --git a/src/org/traccar/protocol/AquilaProtocolDecoder.java b/src/org/traccar/protocol/AquilaProtocolDecoder.java
index ad85c54c2..b2bbf6f93 100644
--- a/src/org/traccar/protocol/AquilaProtocolDecoder.java
+++ b/src/org/traccar/protocol/AquilaProtocolDecoder.java
@@ -32,7 +32,7 @@ public class AquilaProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$\\$" +
             "[^,]+," +                          // Client
             "(\\d+)," +                         // Device serial number
@@ -73,7 +73,7 @@ public class AquilaProtocolDecoder extends BaseProtocolDecoder {
 
         String sentence = (String) msg;
 
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Ardi01ProtocolDecoder.java b/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
index 69146d57e..738af9bb1 100644
--- a/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
@@ -32,7 +32,7 @@ public class Ardi01ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d+)," +                    // IMEI
             "(\\d{4})(\\d{2})(\\d{2})" +   // Date (YYYYMMDD)
             "(\\d{2})(\\d{2})(\\d{2})," +  // Time (HHMMSS)
@@ -54,7 +54,7 @@ public class Ardi01ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/BoxProtocolDecoder.java b/src/org/traccar/protocol/BoxProtocolDecoder.java
index 2820bd826..2b122dfa2 100644
--- a/src/org/traccar/protocol/BoxProtocolDecoder.java
+++ b/src/org/traccar/protocol/BoxProtocolDecoder.java
@@ -20,7 +20,6 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
@@ -33,7 +32,7 @@ public class BoxProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "L," +
             "(\\d{2})(\\d{2})(\\d{2})" +  // Date
             "(\\d{2})(\\d{2})(\\d{2})," + // Time
@@ -72,7 +71,7 @@ public class BoxProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("L,") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/CarTrackProtocolDecoder.java b/src/org/traccar/protocol/CarTrackProtocolDecoder.java
index 5596994a1..d9bf27973 100644
--- a/src/org/traccar/protocol/CarTrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/CarTrackProtocolDecoder.java
@@ -32,7 +32,7 @@ public class CarTrackProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$\\$" +                                      // Header
             "(\\d+)\\?*" +                                  // Device ID
             "&A" +
@@ -61,7 +61,7 @@ public class CarTrackProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/CarscopProtocolDecoder.java b/src/org/traccar/protocol/CarscopProtocolDecoder.java
index 63ed12a2a..6a23d381d 100644
--- a/src/org/traccar/protocol/CarscopProtocolDecoder.java
+++ b/src/org/traccar/protocol/CarscopProtocolDecoder.java
@@ -31,7 +31,7 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\*.*" +
             "(\\d{2})(\\d{2})(\\d{2})" + // Time (HHMMSS)
             "([AV])" +                   // Validity
@@ -63,7 +63,7 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/CityeasyProtocolDecoder.java b/src/org/traccar/protocol/CityeasyProtocolDecoder.java
index b08eb6c2d..158d84ea3 100644
--- a/src/org/traccar/protocol/CityeasyProtocolDecoder.java
+++ b/src/org/traccar/protocol/CityeasyProtocolDecoder.java
@@ -35,7 +35,7 @@ public class CityeasyProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d{4})(\\d{2})(\\d{2})" +        // Date
             "(\\d{2})(\\d{2})(\\d{2})," +       // Time
             "([AV])," +                         // Validity
@@ -82,7 +82,7 @@ public class CityeasyProtocolDecoder extends BaseProtocolDecoder {
         if (type == MSG_LOCATION_REPORT || type == MSG_LOCATION_REQUEST) {
 
             String sentence = buf.toString(buf.readerIndex(), buf.readableBytes() - 8, Charset.defaultCharset());
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
index 809850370..21553fa44 100644
--- a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
@@ -31,7 +31,7 @@ public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\*..," +                          // Manufacturer
             "(\\d+)," +                         // IMEI
             "([^,]{2})," +                      // Command
@@ -64,7 +64,7 @@ public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/EnforaProtocolDecoder.java b/src/org/traccar/protocol/EnforaProtocolDecoder.java
index 3e341ea8b..0c0b5afe9 100644
--- a/src/org/traccar/protocol/EnforaProtocolDecoder.java
+++ b/src/org/traccar/protocol/EnforaProtocolDecoder.java
@@ -34,7 +34,7 @@ public class EnforaProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2}).(\\d+)," + // Time (HHMMSS.SS)
             "([AV])," +                  // Validity
@@ -85,7 +85,7 @@ public class EnforaProtocolDecoder extends BaseProtocolDecoder {
         String sentence = buf.toString(start, buf.readableBytes() - start, Charset.defaultCharset());
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Ev603ProtocolDecoder.java b/src/org/traccar/protocol/Ev603ProtocolDecoder.java
index 34e961084..5926e8963 100644
--- a/src/org/traccar/protocol/Ev603ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Ev603ProtocolDecoder.java
@@ -21,7 +21,6 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
@@ -32,7 +31,7 @@ public class Ev603ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "!.," +                           // Type
             "(\\d{2})/(\\d{2})/(\\d{2})," +   // Date dd/mm/YY
             "(\\d{2}):(\\d{2}):(\\d{2})," +   // Time hh:mm:ss
@@ -57,7 +56,7 @@ public class Ev603ProtocolDecoder extends BaseProtocolDecoder {
         } else {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!hasDeviceId() || !parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/FlextrackProtocolDecoder.java b/src/org/traccar/protocol/FlextrackProtocolDecoder.java
index 6840ba30f..04eed5734 100644
--- a/src/org/traccar/protocol/FlextrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/FlextrackProtocolDecoder.java
@@ -32,13 +32,13 @@ public class FlextrackProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern patternLogon = Pattern.compile(
+    private static final Pattern PATTERN_LOGON = Pattern.compile(
             "(-?\\d+)," +                  // Index
             "LOGON," +
             "(\\d+)," +                    // Node ID
             "(\\d+)");                     // ICCID
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(-?\\d+)," +                  // Index
             "UNITSTAT," +
             "(\\d{4})(\\d{2})(\\d{2})," +  // Date (YYYYMMDD)
@@ -76,7 +76,7 @@ public class FlextrackProtocolDecoder extends BaseProtocolDecoder {
 
         if (sentence.contains("LOGON")) {
 
-            Matcher parser = patternLogon.matcher(sentence);
+            Matcher parser = PATTERN_LOGON.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
@@ -96,7 +96,7 @@ public class FlextrackProtocolDecoder extends BaseProtocolDecoder {
 
         } else if (sentence.contains("UNITSTAT") && hasDeviceId()) {
 
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/FreedomProtocolDecoder.java b/src/org/traccar/protocol/FreedomProtocolDecoder.java
index 2c6accd53..95e7abb4a 100644
--- a/src/org/traccar/protocol/FreedomProtocolDecoder.java
+++ b/src/org/traccar/protocol/FreedomProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -32,7 +30,7 @@ public class FreedomProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "IMEI," +
             "(\\d+)," +                           // IMEI
             "(\\d{4}).(\\d{2}).(\\d{2}), " +      // Date
@@ -48,7 +46,7 @@ public class FreedomProtocolDecoder extends BaseProtocolDecoder {
             throws Exception {
 
         // Parse message
-        Matcher parser = pattern.matcher((String) msg);
+        Matcher parser = PATTERN.matcher((String) msg);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Gl100ProtocolDecoder.java b/src/org/traccar/protocol/Gl100ProtocolDecoder.java
index 3233342c8..db22fdb34 100644
--- a/src/org/traccar/protocol/Gl100ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gl100ProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -32,7 +30,7 @@ public class Gl100ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\+RESP:GT...," +
             "(\\d{15})," +                      // IMEI
             "(?:(?:\\d+," +                     // Number
@@ -66,7 +64,7 @@ public class Gl100ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Gl200ProtocolDecoder.java b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
index 88b9669c8..a0417c9bc 100644
--- a/src/org/traccar/protocol/Gl200ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
@@ -33,13 +33,13 @@ public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern heartbeatPattern = Pattern.compile(
+    private static final Pattern PATTERN_HEARTBEAT = Pattern.compile(
             "\\+ACK:GTHBD," +
             "([0-9A-Z]{2}\\p{XDigit}{4})," +
             ".*," +
             "(\\p{XDigit}{4})\\$?");
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(?:(?:\\+(?:RESP|BUFF):)|" +
             "(?:\\x00?\\x04,\\p{XDigit}{4},[01],))" +
             "GT...," +
@@ -93,7 +93,7 @@ public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Handle heartbeat
-        Matcher parser = heartbeatPattern.matcher(sentence);
+        Matcher parser = PATTERN_HEARTBEAT.matcher(sentence);
         if (parser.matches()) {
             if (channel != null) {
                 channel.write("+SACK:GTHBD," + parser.group(1) + "," + parser.group(2) + "$", remoteAddress);
@@ -102,7 +102,7 @@ public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        parser = pattern.matcher(sentence);
+        parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/GlobalSatProtocolDecoder.java b/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
index 6f55fceef..617c18b71 100644
--- a/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
+++ b/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
@@ -170,7 +170,7 @@ public class GlobalSatProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$" +
             "(\\d+)," +                    // IMEI
             "\\d+," +                      // mode
@@ -190,7 +190,7 @@ public class GlobalSatProtocolDecoder extends BaseProtocolDecoder {
     private Position decodeAlternative(Channel channel, String sentence) {
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/GoSafeProtocolDecoder.java b/src/org/traccar/protocol/GoSafeProtocolDecoder.java
index 90b2e5bea..225070b26 100644
--- a/src/org/traccar/protocol/GoSafeProtocolDecoder.java
+++ b/src/org/traccar/protocol/GoSafeProtocolDecoder.java
@@ -31,7 +31,7 @@ public class GoSafeProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\*[^,]+," +
             "(\\d+)," +                         // IMEI
             "(\\d{2})(\\d{2})(\\d{2})" +        // Time
@@ -59,7 +59,7 @@ public class GoSafeProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/GotopProtocolDecoder.java b/src/org/traccar/protocol/GotopProtocolDecoder.java
index 1f8926bb7..16348cb7f 100644
--- a/src/org/traccar/protocol/GotopProtocolDecoder.java
+++ b/src/org/traccar/protocol/GotopProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Event;
@@ -34,7 +32,7 @@ public class GotopProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d+)," +                         // IMEI
             "[^,]+," +                          // Type
             "([AV])," +                         // Validity
@@ -54,7 +52,7 @@ public class GotopProtocolDecoder extends BaseProtocolDecoder {
 
         // Parse message
         String sentence = (String) msg;
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (sentence.isEmpty() || !parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Gps103ProtocolDecoder.java b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
index cf3264ea8..928c24e12 100644
--- a/src/org/traccar/protocol/Gps103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
@@ -31,7 +31,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "imei:" +
             "(\\d+)," +                         // IMEI
             "([^,]+)," +                        // Alarm
@@ -58,7 +58,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
             "([^,;]+)?,?" +
             ".*");
 
-    private static final Pattern handshakePattern = Pattern.compile("##,imei:(\\d+),A");
+    private static final Pattern PATTERN_HANDSHAKE = Pattern.compile("##,imei:(\\d+),A");
 
     @Override
     protected Object decode(
@@ -71,7 +71,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
         if (sentence.contains("##")) {
             if (channel != null) {
                 channel.write("LOAD", remoteAddress);
-                Matcher handshakeMatcher = handshakePattern.matcher(sentence);
+                Matcher handshakeMatcher = PATTERN_HANDSHAKE.matcher(sentence);
                 if (handshakeMatcher.matches()) {
                     identify(handshakeMatcher.group(1), channel);
                 }
@@ -88,7 +88,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/GpsGateProtocolDecoder.java b/src/org/traccar/protocol/GpsGateProtocolDecoder.java
index 04d9e37fa..97344673c 100644
--- a/src/org/traccar/protocol/GpsGateProtocolDecoder.java
+++ b/src/org/traccar/protocol/GpsGateProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Checksum;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class GpsGateProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.?(?:\\d+)?," + // Time (HHMMSS.SSS)
             "([AV])," +                    // Validity
@@ -91,7 +89,7 @@ public class GpsGateProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("$GPRMC,") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/GpsMarkerProtocolDecoder.java b/src/org/traccar/protocol/GpsMarkerProtocolDecoder.java
index 801ceef0e..c9d9b0cce 100644
--- a/src/org/traccar/protocol/GpsMarkerProtocolDecoder.java
+++ b/src/org/traccar/protocol/GpsMarkerProtocolDecoder.java
@@ -31,7 +31,7 @@ public class GpsMarkerProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$GM" +
             "\\d" +                             // Type
             "(?:\\p{XDigit}{2})?" +             // Index
@@ -59,7 +59,7 @@ public class GpsMarkerProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/GpsmtaProtocolDecoder.java b/src/org/traccar/protocol/GpsmtaProtocolDecoder.java
index 003d833ee..134dc6496 100644
--- a/src/org/traccar/protocol/GpsmtaProtocolDecoder.java
+++ b/src/org/traccar/protocol/GpsmtaProtocolDecoder.java
@@ -15,15 +15,14 @@
  */
 package org.traccar.protocol;
 
-import org.jboss.netty.channel.Channel;
-import org.traccar.BaseProtocolDecoder;
-import org.traccar.model.Event;
-import org.traccar.model.Position;
-
 import java.net.SocketAddress;
 import java.util.Date;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
+import org.traccar.model.Position;
 
 public class GpsmtaProtocolDecoder extends BaseProtocolDecoder {
 
@@ -31,7 +30,7 @@ public class GpsmtaProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d+) " +                         // UID
             "(\\d+) " +                         // Time
             "(\\d+\\.\\d+) " +                  // Latitude
@@ -52,7 +51,7 @@ public class GpsmtaProtocolDecoder extends BaseProtocolDecoder {
 
         String sentence = (String) msg;
 
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/H02ProtocolDecoder.java b/src/org/traccar/protocol/H02ProtocolDecoder.java
index b3b624231..d8cf762f4 100644
--- a/src/org/traccar/protocol/H02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/H02ProtocolDecoder.java
@@ -106,7 +106,7 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\*..," +                          // Manufacturer
             "(\\d+)," +                         // IMEI
             "V\\d," +                           // Version?
@@ -126,7 +126,7 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
     private Position decodeText(String sentence, Channel channel) {
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/HaicomProtocolDecoder.java b/src/org/traccar/protocol/HaicomProtocolDecoder.java
index 8b1097a69..42d806728 100644
--- a/src/org/traccar/protocol/HaicomProtocolDecoder.java
+++ b/src/org/traccar/protocol/HaicomProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class HaicomProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$GPRS" +
             "(\\d+)," +                   // IMEI
             "([^,]+)," +                  // Version
@@ -60,7 +58,7 @@ public class HaicomProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/IntellitracProtocolDecoder.java b/src/org/traccar/protocol/IntellitracProtocolDecoder.java
index 7d91256b3..6c5c0f58a 100644
--- a/src/org/traccar/protocol/IntellitracProtocolDecoder.java
+++ b/src/org/traccar/protocol/IntellitracProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(?:.+,)?(\\d+)," +            // Device Identifier
             "(\\d{4})(\\d{2})(\\d{2})" +   // Date (YYYYMMDD)
             "(\\d{2})(\\d{2})(\\d{2})," +  // Time (HHMMSS)
@@ -69,7 +67,7 @@ public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Jt600ProtocolDecoder.java b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
index fd76b888f..e8cfd8631 100644
--- a/src/org/traccar/protocol/Jt600ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
@@ -15,16 +15,14 @@
  */
 package org.traccar.protocol;
 
-import java.nio.charset.Charset;
 import java.net.SocketAddress;
+import java.nio.charset.Charset;
 import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
 import org.traccar.model.Event;
@@ -121,7 +119,7 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\(" +
             "([\\d]+)," +                // Id
             "W01," +                     // Type
@@ -145,7 +143,7 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         String message = buf.toString(Charset.defaultCharset());
 
         // Parse message
-        Matcher parser = pattern.matcher(message);
+        Matcher parser = PATTERN.matcher(message);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/LaipacProtocolDecoder.java b/src/org/traccar/protocol/LaipacProtocolDecoder.java
index 9962b303d..57cf7d3b3 100644
--- a/src/org/traccar/protocol/LaipacProtocolDecoder.java
+++ b/src/org/traccar/protocol/LaipacProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Checksum;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class LaipacProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$AVRMC," +
             "([^,]+)," +                   // Identifier
             "(\\d{2})(\\d{2})(\\d{2})," +  // Time (HHMMSS)
@@ -63,7 +61,7 @@ public class LaipacProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/ManPowerProtocolDecoder.java b/src/org/traccar/protocol/ManPowerProtocolDecoder.java
index 33d13e663..113215c1b 100644
--- a/src/org/traccar/protocol/ManPowerProtocolDecoder.java
+++ b/src/org/traccar/protocol/ManPowerProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class ManPowerProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "simei:" +
             "(\\d+)," +                         // IMEI
             "[^,]*,[^,]*," +
@@ -57,7 +55,7 @@ public class ManPowerProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/MaxonProtocolDecoder.java b/src/org/traccar/protocol/MaxonProtocolDecoder.java
index 54177af68..14bf285fc 100644
--- a/src/org/traccar/protocol/MaxonProtocolDecoder.java
+++ b/src/org/traccar/protocol/MaxonProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -41,7 +39,7 @@ public class MaxonProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.(\\d{2})," + // Time (HHMMSS.SSS)
             "([AV])," +                    // Validity
@@ -54,11 +52,10 @@ public class MaxonProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{2})(\\d{2})(\\d{2})" +   // Date (DDMMYY)
             ".+");                         // Other (Checksumm)
 
-    private static final Pattern gpfidPattern = Pattern.compile("\\$GPFID,(\\d+)$");
+    private static final Pattern PATTERN_GPFID = Pattern.compile("\\$GPFID,(\\d+)$");
 
-    protected Object decode(
-            Channel channel, SocketAddress remoteAddress, Object msg)
-            throws Exception {
+    @Override
+    protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
         String sentence = (String) msg;
 
@@ -67,7 +64,7 @@ public class MaxonProtocolDecoder extends BaseProtocolDecoder {
         if (sentence.contains("$GPRMC")) {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
@@ -119,7 +116,7 @@ public class MaxonProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(time.getTime());
 
         } else if (sentence.contains("$GPFID") && position != null) {
-            Matcher parser = gpfidPattern.matcher(sentence);
+            Matcher parser = PATTERN_GPFID.matcher(sentence);
 
             if (parser.matches()) {
                 if (!identify(parser.group(1), channel)) {
diff --git a/src/org/traccar/protocol/MegastekProtocolDecoder.java b/src/org/traccar/protocol/MegastekProtocolDecoder.java
index d3d12dd76..37bf5a0d4 100644
--- a/src/org/traccar/protocol/MegastekProtocolDecoder.java
+++ b/src/org/traccar/protocol/MegastekProtocolDecoder.java
@@ -31,7 +31,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern patternGPRMC = Pattern.compile(
+    private static final Pattern PATTERN_GPRMC = Pattern.compile(
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.\\d+," + // Time (HHMMSS.SSS)
             "([AV])," +                    // Validity
@@ -44,7 +44,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{2})(\\d{2})(\\d{2})" +   // Date (DDMMYY)
             ".*");                         // Checksum
 
-    private static final Pattern patternSimple = Pattern.compile(
+    private static final Pattern PATTERN_SIMPLE = Pattern.compile(
             "[FL]," +                      // Flag
             "([^,]*)," +                   // Alarm
             "imei:(\\d+)," +               // IMEI
@@ -57,7 +57,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             "(\\p{XDigit}{4},\\p{XDigit}{4});" + // Location code
             ".+");                         // Checksum
 
-    private static final Pattern patternAlternative = Pattern.compile(
+    private static final Pattern PATTERN_ALTERNATIVE = Pattern.compile(
             "(\\d+)," +                    // MCC
             "(\\d+)," +                    // MNC
             "(\\p{XDigit}{4},\\p{XDigit}{4})," + // Location code
@@ -75,7 +75,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
     private boolean parseGPRMC(String gprmc, Position position) {
 
         // Parse message
-        Matcher parser = patternGPRMC.matcher(gprmc);
+        Matcher parser = PATTERN_GPRMC.matcher(gprmc);
         if (!parser.matches()) {
             return false;
         }
@@ -181,7 +181,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
 
         if (simple) {
 
-            Matcher parser = patternSimple.matcher(status);
+            Matcher parser = PATTERN_SIMPLE.matcher(status);
             if (parser.matches()) {
 
                 int index = 1;
@@ -225,7 +225,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
 
         } else {
 
-            Matcher parser = patternAlternative.matcher(status);
+            Matcher parser = PATTERN_ALTERNATIVE.matcher(status);
             if (!parser.matches()) {
 
                 int index = 1;
@@ -255,7 +255,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
-    private static final Pattern patternNew = Pattern.compile(
+    private static final Pattern PATTERN_NEW = Pattern.compile(
             "\\$MGV\\d{3}," +
             "(\\d+)," +                    // IMEI
             "[^,]*," +                     // Name
@@ -293,7 +293,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
 
     private Position decodeNew(Channel channel, String sentence) {
 
-        Matcher parser = patternNew.matcher(sentence);
+        Matcher parser = PATTERN_NEW.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
index 17fd0d0d4..94aabb5eb 100644
--- a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
@@ -37,7 +37,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d{2})(\\d{2})(\\d{2})\\.?(\\d+)?," + // Time (HHMMSS.SSS)
             "([AV])," +                         // Validity
             "(\\d+)(\\d{2}\\.\\d+)," +          // Latitude (DDMM.MMMM)
@@ -61,7 +61,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             "(?:\\|(\\p{XDigit}{5,}))?)?)?)?)?" + // RFID
             ".*");
 
-    private static final Pattern rfidPattern = Pattern.compile(
+    private static final Pattern PATTERN_RFID = Pattern.compile(
             "\\|(\\d{2})(\\d{2})(\\d{2})," +    // Time (HHMMSS)
             "(\\d{2})(\\d{2})(\\d{2})," +       // Date (DDMMYY)
             "(\\d+)(\\d{2}\\.\\d+)," +          // Latitude (DDMM.MMMM)
@@ -210,7 +210,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
 
         // Parse message
         String sentence = buf.toString(buf.readerIndex(), buf.readableBytes() - 4, Charset.defaultCharset());
-        Matcher parser = (command == MSG_RFID ? rfidPattern : pattern).matcher(sentence);
+        Matcher parser = (command == MSG_RFID ? PATTERN_RFID : PATTERN).matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/MeitrackProtocolDecoder.java b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
index 6b43d1169..220a0c552 100644
--- a/src/org/traccar/protocol/MeitrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
@@ -15,8 +15,8 @@
  */
 package org.traccar.protocol;
 
-import java.nio.charset.Charset;
 import java.net.SocketAddress;
+import java.nio.charset.Charset;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.LinkedList;
@@ -24,10 +24,8 @@ import java.util.List;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
 import org.traccar.helper.UnitsConverter;
@@ -40,7 +38,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$\\$." +                         // Flag
             "\\d+," +                           // Length
             "(\\d+)," +                         // IMEI
@@ -77,7 +75,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
 
         // Parse message
         String sentence = buf.toString(Charset.defaultCharset());
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
index 7cdfab3a8..9a3ac836d 100644
--- a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
+++ b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class MiniFinderProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "!D," +
             "(\\d+)/(\\d+)/(\\d+)," +      // Date
             "(\\d+):(\\d+):(\\d+)," +      // Time
@@ -64,7 +62,7 @@ public class MiniFinderProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("!D") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/MtxProtocolDecoder.java b/src/org/traccar/protocol/MtxProtocolDecoder.java
index 989d8540c..95c57e759 100644
--- a/src/org/traccar/protocol/MtxProtocolDecoder.java
+++ b/src/org/traccar/protocol/MtxProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class MtxProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "#MTX," +
             "(\\d+)," +                         // IMEI
             "(\\d{4})(\\d{2})(\\d{2})," +       // Date
@@ -64,7 +62,7 @@ public class MtxProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Pt3000ProtocolDecoder.java b/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
index 59a9a0160..f2e0a14bc 100644
--- a/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -32,7 +30,7 @@ public class Pt3000ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "%(\\d+)," +                   // IMEI
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.?\\d*," + // Time (HHMMSS.SSS)
@@ -54,7 +52,7 @@ public class Pt3000ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Pt502ProtocolDecoder.java b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
index 3bd971d23..4027a54b2 100644
--- a/src/org/traccar/protocol/Pt502ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
@@ -32,7 +32,7 @@ public class Pt502ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             ".*" +
             "\\$[A-Z]{3}\\d?," +                // Type
             "(\\d+)," +                         // Id
@@ -62,7 +62,7 @@ public class Pt502ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/RitiProtocolDecoder.java b/src/org/traccar/protocol/RitiProtocolDecoder.java
index ca7e2a038..bb7c0b583 100644
--- a/src/org/traccar/protocol/RitiProtocolDecoder.java
+++ b/src/org/traccar/protocol/RitiProtocolDecoder.java
@@ -15,16 +15,14 @@
  */
 package org.traccar.protocol;
 
-import java.nio.charset.Charset;
 import java.net.SocketAddress;
+import java.nio.charset.Charset;
 import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
 import org.traccar.model.Event;
@@ -36,7 +34,7 @@ public class RitiProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.?\\d*," + // Time (HHMMSS.SSS)
             "([AV])," +                    // Validity
@@ -83,7 +81,7 @@ public class RitiProtocolDecoder extends BaseProtocolDecoder {
         Integer end = ChannelBufferTools.find(buf, buf.readerIndex(), buf.readerIndex() + 80, "*");
         String gprmc = buf.toString(
                 buf.readerIndex(), end - buf.readerIndex(), Charset.defaultCharset());
-        Matcher parser = pattern.matcher(gprmc);
+        Matcher parser = PATTERN.matcher(gprmc);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/SanavProtocolDecoder.java b/src/org/traccar/protocol/SanavProtocolDecoder.java
index 24f55a165..77af9b214 100644
--- a/src/org/traccar/protocol/SanavProtocolDecoder.java
+++ b/src/org/traccar/protocol/SanavProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -32,7 +30,7 @@ public class SanavProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             ".*imei[:=]" +
             "(\\d+)" +                          // IMEI
             "&?rmc[:=]\\$GPRMC," +
@@ -54,7 +52,7 @@ public class SanavProtocolDecoder extends BaseProtocolDecoder {
 
         // Parse message
         String sentence = (String) msg;
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Stl060ProtocolDecoder.java b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
index 72952121a..f27f36ab7 100644
--- a/src/org/traccar/protocol/Stl060ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
@@ -31,10 +31,7 @@ public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    //$1,357804047969310,D001,AP29AW0963,01/01/13,13:24:47,1723.9582N,07834.0945E
-    //,00100,010,0,0,0,0,
-    //0,0008478660,1450,40,34,0,0,0,A
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             ".*\\$1," +
             "(\\d+)," +                         // IMEI
             "D001," +                           // Type
@@ -75,7 +72,7 @@ public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/SuntechProtocolDecoder.java b/src/org/traccar/protocol/SuntechProtocolDecoder.java
index 5ef44fa31..19eed1197 100644
--- a/src/org/traccar/protocol/SuntechProtocolDecoder.java
+++ b/src/org/traccar/protocol/SuntechProtocolDecoder.java
@@ -32,7 +32,7 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "S.\\d{3}(?:\\w{3})?;" +       // Header
             "(?:([^;]+);)?" +              // Type
             "(\\d{6,});" +                 // Device ID
@@ -57,7 +57,7 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/T55ProtocolDecoder.java b/src/org/traccar/protocol/T55ProtocolDecoder.java
index 989d24820..ec3919ebe 100644
--- a/src/org/traccar/protocol/T55ProtocolDecoder.java
+++ b/src/org/traccar/protocol/T55ProtocolDecoder.java
@@ -31,7 +31,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern patternGPRMC = Pattern.compile(
+    private static final Pattern PATTERN_GPRMC = Pattern.compile(
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.?\\d*," + // Time (HHMMSS.SSS)
             "([AV])," +                    // Validity
@@ -44,7 +44,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{2})(\\d{2})(\\d{2})" +   // Date (DDMMYY)
             ".+");
 
-    private static final Pattern patternGPGGA = Pattern.compile(
+    private static final Pattern PATTERN_GPGGA = Pattern.compile(
             "\\$GPGGA," +
             "(\\d{2})(\\d{2})(\\d{2})\\.?\\d*," + // Time
             "(\\d+)(\\d{2}\\.\\d+)," +     // Latitude
@@ -53,7 +53,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
             "([EW])," +
             ".+");
 
-    private static final Pattern patternGPRMA = Pattern.compile(
+    private static final Pattern PATTERN_GPRMA = Pattern.compile(
             "\\$GPRMA," +
             "([AV])," +                    // Validity
             "(\\d{2})(\\d{2}\\.\\d+)," +   // Latitude
@@ -64,7 +64,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+\\.?\\d*)?," +           // Course
             ".+");
 
-    private static final Pattern patternTRCCR = Pattern.compile(
+    private static final Pattern PATTERN_TRCCR = Pattern.compile(
             "\\$TRCCR," +
             "(\\d{4})(\\d{2})(\\d{2})" +   // Date (YYYYMMDD)
             "(\\d{2})(\\d{2})(\\d{2})\\.?\\d*," + // Time (HHMMSS.SSS)
@@ -128,7 +128,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
             }
 
             // Parse message
-            Matcher parser = patternGPRMC.matcher(sentence);
+            Matcher parser = PATTERN_GPRMC.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
@@ -186,7 +186,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("$GPGGA") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = patternGPGGA.matcher(sentence);
+            Matcher parser = PATTERN_GPGGA.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
@@ -227,7 +227,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("$GPRMA") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = patternGPRMA.matcher(sentence);
+            Matcher parser = PATTERN_GPRMA.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
@@ -275,7 +275,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
         else if (sentence.startsWith("$TRCCR") && hasDeviceId()) {
 
             // Parse message
-            Matcher parser = patternTRCCR.matcher(sentence);
+            Matcher parser = PATTERN_TRCCR.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/TaipProtocolDecoder.java b/src/org/traccar/protocol/TaipProtocolDecoder.java
index 7545df13e..860dd4602 100644
--- a/src/org/traccar/protocol/TaipProtocolDecoder.java
+++ b/src/org/traccar/protocol/TaipProtocolDecoder.java
@@ -21,9 +21,7 @@ import java.util.Date;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
@@ -37,7 +35,7 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
         this.sendResponse = sendResponse;
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(?:R[EP]V" +                  // Type
             "(?:\\d{2}" +                  // Event index
             "(\\d{4})" +                   // Week
@@ -123,7 +121,7 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/TelikProtocolDecoder.java b/src/org/traccar/protocol/TelikProtocolDecoder.java
index 28df23999..255a3032b 100644
--- a/src/org/traccar/protocol/TelikProtocolDecoder.java
+++ b/src/org/traccar/protocol/TelikProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class TelikProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\d{4}" +
             "(\\d{6})" +                  // Device ID
             "(\\d+)," +                   // Type
@@ -55,7 +53,7 @@ public class TelikProtocolDecoder extends BaseProtocolDecoder {
             throws Exception {
 
         // Parse message
-        Matcher parser = pattern.matcher((String) msg);
+        Matcher parser = PATTERN.matcher((String) msg);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Tk102ProtocolDecoder.java b/src/org/traccar/protocol/Tk102ProtocolDecoder.java
index 78f436a2f..f9db1a9e7 100644
--- a/src/org/traccar/protocol/Tk102ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tk102ProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Position;
 
@@ -32,7 +30,7 @@ public class Tk102ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\[.\\d{10}.\\(\\p{Upper}+" +
             "(\\d{2})(\\d{2})(\\d{2})" +   // Time (HHMMSS)
             "([AV])" +                     // Validity
@@ -71,7 +69,7 @@ public class Tk102ProtocolDecoder extends BaseProtocolDecoder {
         else if (hasDeviceId()) {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/Tk103ProtocolDecoder.java b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
index f2a561050..56d975e46 100644
--- a/src/org/traccar/protocol/Tk103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
@@ -34,7 +34,7 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d+)(,)?" +                 // Device ID
             ".{4},?" +                     // Command
             "\\d*" +                       // IMEI (?)
@@ -76,7 +76,7 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Tlt2hProtocolDecoder.java b/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
index 56d8f59ba..9cbbf570a 100644
--- a/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
@@ -22,9 +22,7 @@ import java.util.List;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -35,14 +33,14 @@ public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern patternHeader = Pattern.compile(
+    private static final Pattern PATTERN_HEADER = Pattern.compile(
             "#(\\d+)#" +                   // IMEI
             "[^#]+#" +
             "\\d+#" +
             "([^#]+)#" +                   // Status
             "\\d+");                       // Number of records
 
-    private static final Pattern patternPosition = Pattern.compile(
+    private static final Pattern PATTERN_POSITION = Pattern.compile(
             "#([0-9a-f]+)?" +              // Cell info
             "\\$GPRMC," +
             "(\\d{2})(\\d{2})(\\d{2})\\.(\\d+)," + // Time (HHMMSS.SSS)
@@ -66,7 +64,7 @@ public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
 
         // Decode header
         String header = sentence.substring(0, sentence.indexOf('\r'));
-        Matcher parser = patternHeader.matcher(header);
+        Matcher parser = PATTERN_HEADER.matcher(header);
         if (!parser.matches()) {
             return null;
         }
@@ -83,7 +81,7 @@ public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
         List<Position> positions = new LinkedList<>();
 
         for (String message : messages) {
-            parser = patternPosition.matcher(message);
+            parser = PATTERN_POSITION.matcher(message);
             if (parser.matches()) {
                 Position position = new Position();
                 position.setProtocol(getProtocolName());
diff --git a/src/org/traccar/protocol/TotemProtocolDecoder.java b/src/org/traccar/protocol/TotemProtocolDecoder.java
index 960cd9963..087416f18 100644
--- a/src/org/traccar/protocol/TotemProtocolDecoder.java
+++ b/src/org/traccar/protocol/TotemProtocolDecoder.java
@@ -32,7 +32,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern1 = new PatternBuilder()
+    private static final Pattern PATTERN1 = new PatternBuilder()
             .txt("$$")                           // header
             .num("xx")                           // length
             .num("(d+)|")                        // imei
@@ -65,7 +65,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             .any()
             .compile();
 
-    private static final Pattern pattern2 = Pattern.compile(
+    private static final Pattern PATTERN2 = Pattern.compile(
             "\\$\\$" +                          // Header
             "\\p{XDigit}{2}" +                  // Length
             "(\\d+)\\|" +                       // IMEI
@@ -92,7 +92,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             "\\p{XDigit}{4}" +                  // Checksum
             "\r?\n?");
 
-    private static final Pattern pattern3 = Pattern.compile(
+    private static final Pattern PATTERN3 = Pattern.compile(
             "\\$\\$" +                          // Header
             "\\p{XDigit}{2}" +                  // Length
             "(\\d+)\\|" +                       // IMEI
@@ -130,13 +130,13 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Determine format
-        Pattern pattern = pattern3;
+        Pattern pattern = PATTERN3;
         if (sentence.contains("$GPRMC")) {
-            pattern = pattern1;
+            pattern = PATTERN1;
         } else {
             int index = sentence.indexOf('|');
             if (index != -1 && sentence.indexOf('|', index + 1) != -1) {
-                pattern = pattern2;
+                pattern = PATTERN2;
             }
         }
 
@@ -161,13 +161,13 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
         // Alarm type
         position.set(Event.KEY_ALARM, parser.group(index++));
 
-        if (pattern == pattern1 || pattern == pattern2) {
+        if (pattern == PATTERN1 || pattern == PATTERN2) {
 
             // Time
             Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
             time.clear();
             int year = 0;
-            if (pattern == pattern2) {
+            if (pattern == PATTERN2) {
                 time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
                 time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
                 year = Integer.parseInt(parser.group(index++));
@@ -205,7 +205,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             }
 
             // Date
-            if (pattern == pattern1) {
+            if (pattern == PATTERN1) {
                 time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
                 time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
                 year = Integer.parseInt(parser.group(index++));
@@ -238,7 +238,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             // Odometer
             position.set(Event.KEY_ODOMETER, parser.group(index++));
 
-        } else if (pattern == pattern3) {
+        } else if (pattern == PATTERN3) {
 
             // Time
             Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
diff --git a/src/org/traccar/protocol/Tr20ProtocolDecoder.java b/src/org/traccar/protocol/Tr20ProtocolDecoder.java
index d097ee3fe..069757820 100644
--- a/src/org/traccar/protocol/Tr20ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tr20ProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
@@ -33,10 +31,10 @@ public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern patternPing = Pattern.compile(
+    private static final Pattern PATTERN_PING = Pattern.compile(
             "%%[^,]+,(\\d+)");
 
-    private static final Pattern patternData = Pattern.compile(
+    private static final Pattern PATTERN_DATA = Pattern.compile(
             "%%" +
             "([^,]+)," +                   // Id
             "([AL])," +                    // Validity
@@ -58,7 +56,7 @@ public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Keep alive message
-        Matcher parser = patternPing.matcher(sentence);
+        Matcher parser = PATTERN_PING.matcher(sentence);
         if (parser.matches()) {
 
             // Send response
@@ -68,7 +66,7 @@ public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
         } else {
 
             // Data message parse
-            parser = patternData.matcher(sentence);
+            parser = PATTERN_DATA.matcher(sentence);
 
             // Unknown message
             if (!parser.matches()) {
diff --git a/src/org/traccar/protocol/Tr900ProtocolDecoder.java b/src/org/traccar/protocol/Tr900ProtocolDecoder.java
index 96f76a420..f8d0a7a5c 100644
--- a/src/org/traccar/protocol/Tr900ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tr900ProtocolDecoder.java
@@ -31,7 +31,7 @@ public class Tr900ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             ">(\\d+)," +                   // ID
             "\\d+," +                      // Period
             "(\\d)," +                     // Fix
@@ -61,7 +61,7 @@ public class Tr900ProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/TrackboxProtocolDecoder.java b/src/org/traccar/protocol/TrackboxProtocolDecoder.java
index 7db437a6e..30b327df6 100644
--- a/src/org/traccar/protocol/TrackboxProtocolDecoder.java
+++ b/src/org/traccar/protocol/TrackboxProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d{2})(\\d{2})(\\d{2})\\.(\\d{3})," + // Time
             "(\\d{2})(\\d{2}\\.\\d{4})([NS])," + // Latitude (DDMM.MMMM)
             "(\\d{3})(\\d{2}\\.\\d{4})([EW])," + // Longitude (DDDMM.MMMM)
@@ -68,7 +66,7 @@ public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
 
         else {
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/V680ProtocolDecoder.java b/src/org/traccar/protocol/V680ProtocolDecoder.java
index abe599754..7628bed88 100644
--- a/src/org/traccar/protocol/V680ProtocolDecoder.java
+++ b/src/org/traccar/protocol/V680ProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class V680ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(?:#(\\d+)#" +                // IMEI
             "([^#]*)#)?" +                 // User
             "(\\d+)#" +                    // Fix
@@ -67,7 +65,7 @@ public class V680ProtocolDecoder extends BaseProtocolDecoder {
         } else {
 
             // Parse message
-            Matcher parser = pattern.matcher(sentence);
+            Matcher parser = PATTERN.matcher(sentence);
             if (!parser.matches()) {
                 return null;
             }
diff --git a/src/org/traccar/protocol/VisiontekProtocolDecoder.java b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
index a1a5cf6c9..f974d08be 100644
--- a/src/org/traccar/protocol/VisiontekProtocolDecoder.java
+++ b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
@@ -32,7 +32,7 @@ public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$1," +
             "([^,]+)," +                        // Identifier
             "(?:(\\d+),)?" +                    // IMEI
@@ -63,7 +63,7 @@ public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/WialonProtocolDecoder.java b/src/org/traccar/protocol/WialonProtocolDecoder.java
index fea00a536..5df26229a 100644
--- a/src/org/traccar/protocol/WialonProtocolDecoder.java
+++ b/src/org/traccar/protocol/WialonProtocolDecoder.java
@@ -22,9 +22,7 @@ import java.util.List;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Event;
@@ -36,7 +34,7 @@ public class WialonProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(\\d{2})(\\d{2})(\\d{2});" +  // Date (DDMMYY)
             "(\\d{2})(\\d{2})(\\d{2});" +  // Time (HHMMSS)
             "(\\d{2})(\\d{2}\\.\\d+);" +   // Latitude (DDMM.MMMM)
@@ -70,7 +68,7 @@ public class WialonProtocolDecoder extends BaseProtocolDecoder {
     private Position decodePosition(String substring) {
 
         // Parse message
-        Matcher parser = pattern.matcher(substring);
+        Matcher parser = PATTERN.matcher(substring);
         if (!hasDeviceId() || !parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/WondexProtocolDecoder.java b/src/org/traccar/protocol/WondexProtocolDecoder.java
index dbd15c3d0..c2a5a2201 100644
--- a/src/org/traccar/protocol/WondexProtocolDecoder.java
+++ b/src/org/traccar/protocol/WondexProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Event;
@@ -34,7 +32,7 @@ public class WondexProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "[^\\d]*" +                    // Header
             "(\\d+)," +                    // Device Identifier
             "(\\d{4})(\\d{2})(\\d{2})" +   // Date (YYYYMMDD)
@@ -59,7 +57,7 @@ public class WondexProtocolDecoder extends BaseProtocolDecoder {
             throws Exception {
 
         // Parse message
-        Matcher parser = pattern.matcher((String) msg);
+        Matcher parser = PATTERN.matcher((String) msg);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/XexunProtocolDecoder.java b/src/org/traccar/protocol/XexunProtocolDecoder.java
index 1a32dbacd..32d8eb427 100644
--- a/src/org/traccar/protocol/XexunProtocolDecoder.java
+++ b/src/org/traccar/protocol/XexunProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.PatternBuilder;
 import org.traccar.model.Event;
@@ -37,7 +35,7 @@ public class XexunProtocolDecoder extends BaseProtocolDecoder {
         this.full = full;
     }
 
-    private static final Pattern patternBasic = new PatternBuilder()
+    private static final Pattern PATTERN_BASIC = new PatternBuilder()
             .xpr("G[PN]RMC,")
             .num("(dd)(dd)(dd).(d+),")           // time
             .xpr("([AV]),")                      // validity
@@ -54,11 +52,11 @@ public class XexunProtocolDecoder extends BaseProtocolDecoder {
             .num("imei:(d+),")                   // imei
             .compile();
 
-    private static final Pattern patternFull = new PatternBuilder()
+    private static final Pattern PATTERN_FULL = new PatternBuilder()
             .any()
             .num("(d+),")                        // serial
             .xpr("([^,]+)?,")                    // phone number
-            .xpr(patternBasic.pattern())
+            .xpr(PATTERN_BASIC.pattern())
             .num("(d+),")                        // satellites
             .num("(-?d+.d+)?,")                  // altitude
             .num("[FL]:(d+.d+)V")                // power
@@ -68,7 +66,7 @@ public class XexunProtocolDecoder extends BaseProtocolDecoder {
     @Override
     protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
-        Pattern pattern = full ? patternFull : patternBasic;
+        Pattern pattern = full ? PATTERN_FULL : PATTERN_BASIC;
         Matcher parser = pattern.matcher((String) msg);
         if (!parser.matches()) {
             return null;
diff --git a/src/org/traccar/protocol/XirgoProtocolDecoder.java b/src/org/traccar/protocol/XirgoProtocolDecoder.java
index f58136a21..400d3c76c 100644
--- a/src/org/traccar/protocol/XirgoProtocolDecoder.java
+++ b/src/org/traccar/protocol/XirgoProtocolDecoder.java
@@ -32,7 +32,7 @@ public class XirgoProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "\\$\\$" +
             "(\\d+)," +                         // IMEI
             "(\\d+)," +                         // Event
@@ -59,7 +59,7 @@ public class XirgoProtocolDecoder extends BaseProtocolDecoder {
         String sentence = (String) msg;
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }
diff --git a/src/org/traccar/protocol/Xt013ProtocolDecoder.java b/src/org/traccar/protocol/Xt013ProtocolDecoder.java
index a61e8b82b..3c3c06b3d 100644
--- a/src/org/traccar/protocol/Xt013ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Xt013ProtocolDecoder.java
@@ -15,18 +15,17 @@
  */
 package org.traccar.protocol;
 
-import org.jboss.netty.channel.Channel;
-import org.traccar.BaseProtocolDecoder;
-import org.traccar.helper.UnitsConverter;
-import org.traccar.model.Event;
-import org.traccar.model.Position;
-
-import java.text.ParseException;
 import java.net.SocketAddress;
+import java.text.ParseException;
 import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Event;
+import org.traccar.model.Position;
 
 public class Xt013ProtocolDecoder extends BaseProtocolDecoder {
 
@@ -34,7 +33,7 @@ public class Xt013ProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "(?:HI,\\d+)?" +
             "TK," +
             "(\\d+)," +                         // IMEI
@@ -64,7 +63,7 @@ public class Xt013ProtocolDecoder extends BaseProtocolDecoder {
 
         // Parse message
         String sentence = (String) msg;
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             throw new ParseException(null, 0);
         }
diff --git a/src/org/traccar/protocol/YwtProtocolDecoder.java b/src/org/traccar/protocol/YwtProtocolDecoder.java
index 9b3d2eb86..be76d1d86 100644
--- a/src/org/traccar/protocol/YwtProtocolDecoder.java
+++ b/src/org/traccar/protocol/YwtProtocolDecoder.java
@@ -20,9 +20,7 @@ import java.util.Calendar;
 import java.util.TimeZone;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.jboss.netty.channel.Channel;
-
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
@@ -33,7 +31,7 @@ public class YwtProtocolDecoder extends BaseProtocolDecoder {
         super(protocol);
     }
 
-    private static final Pattern pattern = Pattern.compile(
+    private static final Pattern PATTERN = Pattern.compile(
             "%(..)," +                     // Type
             "(\\d+):" +                    // Unit identifier
             "\\d+," +                      // Subtype
@@ -74,7 +72,7 @@ public class YwtProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Parse message
-        Matcher parser = pattern.matcher(sentence);
+        Matcher parser = PATTERN.matcher(sentence);
         if (!parser.matches()) {
             return null;
         }