Fix various logging related issues.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
index 2a7574b..4f4c1e4 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
@@ -51,7 +51,7 @@
 	ObjectMapper mapper = new ObjectMapper();
 	String flowPathStr = flowJson;
 	FlowPath flowPath = null;
-	log.debug("Add Flow Path: " + flowPathStr);
+	log.debug("Add Flow Path: {}", flowPathStr);
 	try {
 	    flowPath = mapper.readValue(flowPathStr, FlowPath.class);
 	} catch (JsonGenerationException e) {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
index d0991e8..ab68584 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
@@ -46,7 +46,7 @@
 	    result = flowService.deleteAllFlows();
 	} else {
 	    FlowId flowId = new FlowId(flowIdStr);
-	    log.debug("Delete Flow Id: " + flowIdStr);
+	    log.debug("Delete Flow Id: {}", flowIdStr);
 	    result = flowService.deleteFlow(flowId);
 	}
 	return result;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
index 1bfb6a3..1cbeece 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
@@ -41,7 +41,7 @@
 	String flowIdStr = (String) getRequestAttributes().get("flow-id");
 	FlowId flowId = new FlowId(flowIdStr);
 
-	log.debug("Get Flow Id: " + flowIdStr);
+	log.debug("Get Flow Id: {}", flowIdStr);
 
 	result = flowService.getFlow(flowId);
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
index 9cffb56..aa31abd 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
@@ -47,8 +47,8 @@
         // Extract the arguments
     	String flowIdStr = (String) getRequestAttributes().get("flow-id");
     	String maxFlowStr = (String) getRequestAttributes().get("max-flows");
-    	log.debug("Get Summary Flows starting flow-id: " + flowIdStr + " max-flows: " + maxFlowStr);
-    	
+    	log.debug("Get Summary Flows starting flow-id: {} max-flows: {}" ,flowIdStr, maxFlowStr);
+
     	flowId = new FlowId(flowIdStr);
     	maxFlows = Integer.parseInt(maxFlowStr);
     	if (maxFlows < 0) maxFlows = 0;