diff --git a/src/main/java/net/onrc/onos/graph/TitanDBOperation.java b/src/main/java/net/onrc/onos/graph/TitanDBOperation.java
index 66221f3..7b7f73f 100644
--- a/src/main/java/net/onrc/onos/graph/TitanDBOperation.java
+++ b/src/main/java/net/onrc/onos/graph/TitanDBOperation.java
@@ -143,6 +143,7 @@
 
     @Override
     public IDBConnection getDBConnection() {
+	System.out.println("TitangetDBConnection");
         return conn;
     }
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
index 5a2fc7f..0f6aef3 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
@@ -439,7 +439,11 @@
 		Map<String, String> configMap = context.getConfigParams(this);
 		String conf = configMap.get(DBConfigFile);
                 String dbStore = configMap.get(GraphDBStore);
+		System.out.println("conf" + conf + "dbStore" + dbStore);
 		op = GraphDBManager.getDBOperation(dbStore, conf);
+		if (op == null) {
+		    System.out.println("publisher op is null");
+		}
 		
 		floodlightProvider =
 	            context.getServiceImpl(IFloodlightProviderService.class);