Do not add "=null" when converting to String
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
index 5ae87b0..762d272 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
@@ -329,36 +329,25 @@
 	if ( flowEntryId != null ) {
 		ret.append("[flowEntryId=" + this.flowEntryId.toString());
 	} else {
-		ret.append("[flowEntryId=null");
+		ret.append("[");
 	}
 	if ( flowEntryMatch != null ) {
 		ret.append(" flowEntryMatch=" + this.flowEntryMatch.toString());
-	} else {
-		ret.append(" flowEntryMatch=null");
 	}
 	ret.append( " flowEntryActions=" + this.flowEntryActions.toString() );
 	if ( dpid != null ) {
 		ret.append(" dpid=" + this.dpid.toString());
-	} else {
-		ret.append(" dpid=null");
 	}
 	if ( inPort != null ) {
 		ret.append(" inPort=" + this.inPort.toString());
-	} else {
-		ret.append(" inPort=null");
 	}
 	if ( outPort != null ) {
 		ret.append(" outPort=" + this.outPort.toString());
-	} else {
-		ret.append(" outPort=null");
 	}
 	ret.append(" flowEntryUserState=" + this.flowEntryUserState);
 	ret.append(" flowEntrySwitchState=" + this.flowEntrySwitchState);
 	if ( flowEntryErrorState != null ) {
 		ret.append(" flowEntryErrorState=" + this.flowEntryErrorState.toString());
-	} else {
-		ret.append(" flowEntryErrorState=null" );
-		
 	}
 	ret.append("]");
 
diff --git a/src/test/java/net/onrc/onos/ofcontroller/util/FlowEntryTest.java b/src/test/java/net/onrc/onos/ofcontroller/util/FlowEntryTest.java
index a4dd8e9..1d193c4 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/util/FlowEntryTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/util/FlowEntryTest.java
@@ -203,7 +203,7 @@
 	@Test
 	public void testToString(){
 		FlowEntry def = new FlowEntry();
-		assertEquals( def.toString(), "[flowEntryId=null flowEntryMatch=null flowEntryActions=[] dpid=null inPort=null outPort=null flowEntryUserState=FE_USER_UNKNOWN flowEntrySwitchState=FE_SWITCH_UNKNOWN flowEntryErrorState=null]" );
+		assertEquals( def.toString(), "[ flowEntryActions=[] flowEntryUserState=FE_USER_UNKNOWN flowEntrySwitchState=FE_SWITCH_UNKNOWN]" );
 		assertEquals( entry.toString(), "[flowEntryId=0x5678 flowEntryMatch=[inPort=1 srcMac=01:02:03:04:05:06 dstMac=06:05:04:03:02:01 ethernetFrameType=2 vlanId=3 vlanPriority=4 srcIPv4Net=127.0.0.1/32 dstIPv4Net=127.0.0.2/32 ipProto=5 ipToS=6 srcTcpUdpPort=7 dstTcpUdpPort=8] flowEntryActions=[[type=ACTION_OUTPUT action=[port=9 maxLen=0]];[type=ACTION_OUTPUT action=[port=-3 maxLen=0]];[type=ACTION_SET_VLAN_VID action=[vlanId=3]];[type=ACTION_SET_VLAN_PCP action=[vlanPriority=4]];[type=ACTION_STRIP_VLAN action=[stripVlan=true]];[type=ACTION_SET_DL_SRC action=[addr=01:02:03:04:05:06]];[type=ACTION_SET_DL_DST action=[addr=06:05:04:03:02:01]];[type=ACTION_SET_NW_SRC action=[addr=127.0.0.3]];[type=ACTION_SET_NW_DST action=[addr=127.0.0.4]];[type=ACTION_SET_NW_TOS action=[ipToS=6]];[type=ACTION_SET_TP_SRC action=[port=7]];[type=ACTION_SET_TP_DST action=[port=8]];[type=ACTION_ENQUEUE action=[port=10 queueId=11]];] dpid=00:00:00:00:00:00:ca:fe inPort=1 outPort=9 flowEntryUserState=FE_USER_ADD flowEntrySwitchState=FE_SWITCH_UPDATED flowEntryErrorState=[type=12 code=13]]" );
 	}
 
diff --git a/src/test/java/net/onrc/onos/ofcontroller/util/FlowPathTest.java b/src/test/java/net/onrc/onos/ofcontroller/util/FlowPathTest.java
index 00ed6ec..89a12e5 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/util/FlowPathTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/util/FlowPathTest.java
@@ -166,7 +166,7 @@
 	@Test
 	public void testToString(){
 
-		assertEquals("[flowId=0x1234 installerId=installerId flowPathFlags=[flags=] dataPath=[src=00:00:00:00:00:00:ca:fe/1 flowEntry=[flowEntryId=0x14 flowEntryMatch=[] flowEntryActions=[[type=ACTION_OUTPUT action=[port=23 maxLen=24]];[type=ACTION_OUTPUT action=[port=25 maxLen=26]];] dpid=00:00:00:00:00:00:be:ef inPort=null outPort=null flowEntryUserState=FE_USER_MODIFY flowEntrySwitchState=FE_SWITCH_UPDATE_IN_PROGRESS flowEntryErrorState=null] dst=00:00:00:00:00:00:ba:be/2] flowEntryMatch=[] flowEntryActions=[[type=ACTION_OUTPUT action=[port=10 maxLen=11]];[type=ACTION_OUTPUT action=[port=12 maxLen=13]];]]", flowPath.toString());
+		assertEquals("[flowId=0x1234 installerId=installerId flowPathFlags=[flags=] dataPath=[src=00:00:00:00:00:00:ca:fe/1 flowEntry=[flowEntryId=0x14 flowEntryMatch=[] flowEntryActions=[[type=ACTION_OUTPUT action=[port=23 maxLen=24]];[type=ACTION_OUTPUT action=[port=25 maxLen=26]];] dpid=00:00:00:00:00:00:be:ef flowEntryUserState=FE_USER_MODIFY flowEntrySwitchState=FE_SWITCH_UPDATE_IN_PROGRESS] dst=00:00:00:00:00:00:ba:be/2] flowEntryMatch=[] flowEntryActions=[[type=ACTION_OUTPUT action=[port=10 maxLen=11]];[type=ACTION_OUTPUT action=[port=12 maxLen=13]];]]", flowPath.toString());
 	}
 
 	@Test