Make Logger instance final as SL4J suggests
diff --git a/src/main/java/net/floodlightcontroller/core/module/FloodlightModuleLoader.java b/src/main/java/net/floodlightcontroller/core/module/FloodlightModuleLoader.java
index 5561327..2686d00 100644
--- a/src/main/java/net/floodlightcontroller/core/module/FloodlightModuleLoader.java
+++ b/src/main/java/net/floodlightcontroller/core/module/FloodlightModuleLoader.java
@@ -32,7 +32,7 @@
  *
  */
 public class FloodlightModuleLoader {
-    protected static Logger logger = 
+    protected final static Logger logger = 
             LoggerFactory.getLogger(FloodlightModuleLoader.class);
 
     protected static Map<Class<? extends IFloodlightService>,