Make Logger instance final as SL4J suggests
diff --git a/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java b/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
index 1cf344d..06b48a2 100644
--- a/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
+++ b/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
@@ -15,7 +15,7 @@
 import org.slf4j.LoggerFactory;
 
 public class TopologyManagerTest extends FloodlightTestCase {
-    protected static Logger log = LoggerFactory.getLogger(TopologyManagerTest.class);
+    protected final static Logger log = LoggerFactory.getLogger(TopologyManagerTest.class);
     TopologyManager tm;
     FloodlightModuleContext fmc;