diff --git a/java_gen/pre-written/src/main/java/org/openflow/types/U8.java b/java_gen/pre-written/src/main/java/org/openflow/types/U8.java
new file mode 100644
index 0000000..1cdf0e5
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/openflow/types/U8.java
@@ -0,0 +1,34 @@
+/**
+ *    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
+ *    University
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *    not use this file except in compliance with the License. You may obtain
+ *    a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *    License for the specific language governing permissions and limitations
+ *    under the License.
+ **/
+
+package org.openflow.types;
+
+public class U8 {
+    byte data;
+
+    public static short f(final byte i) {
+        return (short) (i & 0xff);
+    }
+
+    public static byte t(final short l) {
+        return (byte) l;
+    }
+
+    public byte getValue() {
+        return data;
+    }
+}