Make Logger instance final as SL4J suggests
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/web/ClearFlowTableResource.java b/src/main/java/net/onrc/onos/ofcontroller/core/web/ClearFlowTableResource.java
index 7b1acfe..fe70877 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/web/ClearFlowTableResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/web/ClearFlowTableResource.java
@@ -16,7 +16,7 @@
 import org.slf4j.LoggerFactory;
 
 public class ClearFlowTableResource extends ServerResource {
-	static Logger log = LoggerFactory.getLogger(ClearFlowTableResource.class);
+	final static Logger log = LoggerFactory.getLogger(ClearFlowTableResource.class);
 
 	@Post("json")
 	public List<String> ClearFlowTable(String jsonData){