finalize some fields

src/main/java/de/hottis/common/TriggerTimer.java

@@ -3,12 +3,13 @@ package de.hottis.common;
 import java.util.TimerTask;
 
 public class TriggerTimer extends TimerTask {
-	private ITriggerable triggerable;
+	private final ITriggerable triggerable;
 
 	public TriggerTimer(ITriggerable triggerable) {
 		this.triggerable = triggerable;
 	}
 	
+        @Override
 	public void run() {
 		triggerable.trigger();
 	}