add another GraphDBOperation constructor which creates an instance directry from GraphDBConnection configuration path.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java b/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
index a051d4c..0184915 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
@@ -23,8 +23,6 @@
 import net.onrc.onos.ofcontroller.util.FlowEntry;
 import net.onrc.onos.ofcontroller.util.Port;
 import net.onrc.onos.ofcontroller.util.SwitchPort;
-import net.onrc.onos.util.GraphDBConnection;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.openflow.util.HexString;
@@ -32,7 +30,6 @@
 import org.slf4j.LoggerFactory;
 
 import com.tinkerpop.blueprints.Direction;
-import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
 import com.tinkerpop.blueprints.Vertex;
 import com.tinkerpop.pipes.PipeFunction;
 import com.tinkerpop.pipes.branch.LoopPipe.LoopBundle;
@@ -135,7 +132,7 @@
     public void init(FloodlightModuleContext context)
 	throws FloodlightModuleException {
 	// TODO: Add the appropriate initialization
-    	op = new GraphDBOperation(GraphDBConnection.getInstance(""));
+    	op = new GraphDBOperation("");
     }
 
     @Override