diff --git a/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java b/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java
new file mode 100644
index 0000000..83d02da
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java
@@ -0,0 +1,34 @@
+package org.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+
+public class OFMetadata extends U64 implements OFValueType<OFMetadata> {
+    
+    private static int LENGTH = 8;
+
+    protected OFMetadata(long raw) {
+        super(raw);
+    }
+
+    public static OFMetadata of(long raw) {
+        return new OFMetadata(raw);
+    }
+    
+    public static OFMetadata read8Bytes(ChannelBuffer cb) {
+        return OFMetadata.of(cb.readLong());
+    }
+    
+    public void write8Bytes(ChannelBuffer cb) {
+        cb.writeLong(super.getValue());
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public OFMetadata applyMask(OFMetadata mask) {
+        return OFMetadata.of(this.getValue() & mask.getValue());
+    }
+}