Make Logger instance final as SL4J suggests
diff --git a/src/main/java/net/floodlightcontroller/storage/AbstractStorageSource.java b/src/main/java/net/floodlightcontroller/storage/AbstractStorageSource.java
index aae3962..20d6599 100644
--- a/src/main/java/net/floodlightcontroller/storage/AbstractStorageSource.java
+++ b/src/main/java/net/floodlightcontroller/storage/AbstractStorageSource.java
@@ -49,7 +49,7 @@
 @LogMessageCategory("System Database")
 public abstract class AbstractStorageSource 
     implements IStorageSourceService, IFloodlightModule {
-    protected static Logger logger = LoggerFactory.getLogger(AbstractStorageSource.class);
+    protected final static Logger logger = LoggerFactory.getLogger(AbstractStorageSource.class);
 
     // Shared instance of the executor to use to execute the storage tasks.
     // We make this a single threaded executor, because if we used a thread pool
diff --git a/src/main/java/net/floodlightcontroller/storage/nosql/NoSqlStorageSource.java b/src/main/java/net/floodlightcontroller/storage/nosql/NoSqlStorageSource.java
index d7e5f95..6624932 100644
--- a/src/main/java/net/floodlightcontroller/storage/nosql/NoSqlStorageSource.java
+++ b/src/main/java/net/floodlightcontroller/storage/nosql/NoSqlStorageSource.java
@@ -49,7 +49,7 @@
 import net.floodlightcontroller.storage.TypeMismatchStorageException;
 
 public abstract class NoSqlStorageSource extends AbstractStorageSource {
-    protected static Logger log = LoggerFactory.getLogger(NoSqlStorageSource.class);
+    protected final static Logger log = LoggerFactory.getLogger(NoSqlStorageSource.class);
 
     public enum ColumnIndexMode { NOT_INDEXED, RANGE_INDEXED, EQUALITY_INDEXED };
     
diff --git a/src/main/java/net/floodlightcontroller/storage/web/StorageNotifyResource.java b/src/main/java/net/floodlightcontroller/storage/web/StorageNotifyResource.java
index fcfa96f..081c7f9 100644
--- a/src/main/java/net/floodlightcontroller/storage/web/StorageNotifyResource.java
+++ b/src/main/java/net/floodlightcontroller/storage/web/StorageNotifyResource.java
@@ -32,7 +32,7 @@
 import org.slf4j.LoggerFactory;
 
 public class StorageNotifyResource extends ServerResource {
-    protected static Logger log = LoggerFactory.getLogger(StorageNotifyResource.class);
+    protected final static Logger log = LoggerFactory.getLogger(StorageNotifyResource.class);
     
     @Post("json")
     public Map<String,Object> notify(String entity) throws Exception {