Fix warnings in OFBufferID
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBufferId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBufferId.java
index f541b61..f3812dd 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBufferId.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBufferId.java
@@ -1,8 +1,6 @@
 package org.projectfloodlight.openflow.types;
 
-import org.jboss.netty.buffer.ChannelBuffer;
 import org.projectfloodlight.openflow.annotations.Immutable;
-import org.projectfloodlight.openflow.exceptions.OFParseError;
 
 import com.google.common.primitives.UnsignedInts;