diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
index 72ed3da..b082f8b 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
@@ -2,6 +2,8 @@
 
 import javax.annotation.concurrent.Immutable;
 
+import org.jboss.netty.buffer.ChannelBuffer;
+
 import com.google.common.hash.PrimitiveSink;
 import com.google.common.primitives.UnsignedInts;
 
@@ -65,6 +67,14 @@
         return true;
     }
 
+    public void write4Bytes(ChannelBuffer c) {
+        c.writeInt(rawValue);
+    }
+
+    public static ClassId read4Bytes(ChannelBuffer c) {
+        return ClassId.of(c.readInt());
+    }
+
     @Override
     public int compareTo(ClassId o) {
         return UnsignedInts.compare(rawValue, rawValue);