add another GraphDBOperation constructor which creates an instance directry from GraphDBConnection configuration path.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java b/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java
index 125acf3..c464b89 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java
@@ -49,7 +49,6 @@
 import net.onrc.onos.ofcontroller.util.IPv4Net;
 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.GraphDBOperation;
 
 import org.openflow.protocol.OFFlowMod;
@@ -413,7 +412,7 @@
 
     @Override
     public void init(String conf) {
-    	op = new GraphDBOperation(GraphDBConnection.getInstance(conf));
+    	op = new GraphDBOperation(conf);
     }
 
     public void finalize() {