4 files changed, 6 insertions, 9 deletions
diff --git a/src/org/traccar/command/CommandType.java b/src/org/traccar/command/CommandType.java
index b5f6393b6..56596fa41 100644
--- a/src/org/traccar/command/CommandType.java
+++ b/src/org/traccar/command/CommandType.java
@@ -8,8 +8,7 @@ public enum CommandType implements Factory {
     STOP_ENGINE(NoParameterCommand.class),
     RESUME_ENGINE(NoParameterCommand.class);
 
-
-    private Class<? extends GpsCommand> commandClass;
+    private final Class<? extends GpsCommand> commandClass;
 
     CommandType(Class<? extends GpsCommand> commandClass) {
         this.commandClass = commandClass;
@@ -19,10 +18,8 @@ public enum CommandType implements Factory {
     public Object create() {
         try {
             return commandClass.newInstance();
-        } catch (InstantiationException e) {
-            throw new RuntimeException(e);
-        } catch (IllegalAccessException e) {
-            throw new RuntimeException(e);
+        } catch (InstantiationException | IllegalAccessException error) {
+            throw new RuntimeException(error);
         }
     }
 }
diff --git a/src/org/traccar/command/FixPositioningCommand.java b/src/org/traccar/command/FixPositioningCommand.java
index 1304e1f3f..18d5f32fb 100644
--- a/src/org/traccar/command/FixPositioningCommand.java
+++ b/src/org/traccar/command/FixPositioningCommand.java
@@ -10,7 +10,7 @@ public class FixPositioningCommand extends GpsCommand {
 
     @Override
     public Map<String, Object> getReplacements() {
-        Map<String, Object> replacements = new HashMap<String, Object>();
+        Map<String, Object> replacements = new HashMap<>();
         replacements.put(FREQUENCY, data);
         return replacements;
     }
diff --git a/src/org/traccar/command/NoParameterCommand.java b/src/org/traccar/command/NoParameterCommand.java
index afb0f3aee..f4e139b7b 100644
--- a/src/org/traccar/command/NoParameterCommand.java
+++ b/src/org/traccar/command/NoParameterCommand.java
@@ -6,6 +6,6 @@ import java.util.Map;
 public class NoParameterCommand extends GpsCommand {
     @Override
     public Map<String, Object> getReplacements() {
-        return new HashMap<String, Object>();
+        return new HashMap<>();
     }
 }
diff --git a/src/org/traccar/command/StringCommandTemplate.java b/src/org/traccar/command/StringCommandTemplate.java
index 12470d441..3f326e534 100644
--- a/src/org/traccar/command/StringCommandTemplate.java
+++ b/src/org/traccar/command/StringCommandTemplate.java
@@ -8,7 +8,7 @@ import java.util.Map;
 public class StringCommandTemplate<T extends GpsCommand> implements CommandTemplate<T> {
 
     private String messageTemplate;
-    private Map<Class<?>, CommandValueConversion> converters = new HashMap<Class<?>, CommandValueConversion>();
+    private Map<Class<?>, CommandValueConversion> converters = new HashMap<>();
 
     public StringCommandTemplate(String template, Object... replacements) {
         this.messageTemplate = String.format(template, replacements);