4 files changed, 14 insertions, 14 deletions
diff --git a/src/org/traccar/helper/Checksum.java b/src/org/traccar/helper/Checksum.java
index c156e53f7..6a0a35b16 100644
--- a/src/org/traccar/helper/Checksum.java
+++ b/src/org/traccar/helper/Checksum.java
@@ -16,7 +16,7 @@
 package org.traccar.helper;
 
 import java.nio.ByteBuffer;
-import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.zip.CRC32;
 
 public final class Checksum {
@@ -158,7 +158,7 @@ public final class Checksum {
 
     public static String nmea(String msg) {
         int checksum = 0;
-        for (byte b : msg.getBytes(Charset.defaultCharset())) {
+        for (byte b : msg.getBytes(StandardCharsets.US_ASCII)) {
             checksum ^= b;
         }
         return String.format("*%02x", checksum).toUpperCase();
@@ -166,7 +166,7 @@ public final class Checksum {
 
     public static String sum(String msg) {
         byte checksum = 0;
-        for (byte b : msg.getBytes(Charset.defaultCharset())) {
+        for (byte b : msg.getBytes(StandardCharsets.US_ASCII)) {
             checksum += b;
         }
         return String.format("%02X", checksum).toUpperCase();
diff --git a/src/org/traccar/helper/Hashing.java b/src/org/traccar/helper/Hashing.java
index 29020f3a7..38ae5813e 100644
--- a/src/org/traccar/helper/Hashing.java
+++ b/src/org/traccar/helper/Hashing.java
@@ -15,11 +15,11 @@
  */
 package org.traccar.helper;
 
-import java.security.GeneralSecurityException;
-import java.security.SecureRandom;
 import javax.crypto.SecretKeyFactory;
 import javax.crypto.spec.PBEKeySpec;
 import javax.xml.bind.DatatypeConverter;
+import java.security.GeneralSecurityException;
+import java.security.SecureRandom;
 
 public final class Hashing {
 
diff --git a/src/org/traccar/helper/Log.java b/src/org/traccar/helper/Log.java
index 2b747734e..d13210a17 100644
--- a/src/org/traccar/helper/Log.java
+++ b/src/org/traccar/helper/Log.java
@@ -15,13 +15,6 @@
  */
 package org.traccar.helper;
 
-import java.io.IOException;
-import java.lang.management.ManagementFactory;
-import java.lang.management.MemoryMXBean;
-import java.lang.management.OperatingSystemMXBean;
-import java.lang.management.RuntimeMXBean;
-import java.nio.charset.Charset;
-
 import org.apache.log4j.Appender;
 import org.apache.log4j.DailyRollingFileAppender;
 import org.apache.log4j.Layout;
@@ -35,6 +28,13 @@ import org.jboss.netty.logging.InternalLogger;
 import org.jboss.netty.logging.InternalLoggerFactory;
 import org.traccar.Config;
 
+import java.io.IOException;
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryMXBean;
+import java.lang.management.OperatingSystemMXBean;
+import java.lang.management.RuntimeMXBean;
+import java.nio.charset.Charset;
+
 public final class Log {
 
     private Log() {
diff --git a/src/org/traccar/helper/StringFinder.java b/src/org/traccar/helper/StringFinder.java
index da6a9bdc2..6c1dafcfd 100644
--- a/src/org/traccar/helper/StringFinder.java
+++ b/src/org/traccar/helper/StringFinder.java
@@ -18,7 +18,7 @@ package org.traccar.helper;
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.buffer.ChannelBufferIndexFinder;
 
-import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 
 public class StringFinder implements ChannelBufferIndexFinder {
 
@@ -35,7 +35,7 @@ public class StringFinder implements ChannelBufferIndexFinder {
             return false;
         }
 
-        return string.equals(buffer.toString(guessedIndex, string.length(), Charset.defaultCharset()));
+        return string.equals(buffer.toString(guessedIndex, string.length(), StandardCharsets.US_ASCII));
     }
 
 }