Make Logger instance final as SL4J suggests
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
index e11814b..cad5d9c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
@@ -64,7 +64,7 @@
     private static long nextFlowEntryId = 0;
 
     /** The logger. */
-    private static Logger log = LoggerFactory.getLogger(FlowManager.class);
+    private final static Logger log = LoggerFactory.getLogger(FlowManager.class);
 
     // The periodic task(s)
     private ScheduledExecutorService mapReaderScheduler;