diff --git a/java_gen/pre-written/src/main/java/org/openflow/protocol/OFObject.java b/java_gen/pre-written/src/main/java/org/openflow/protocol/OFObject.java
new file mode 100644
index 0000000..21a4607
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/openflow/protocol/OFObject.java
@@ -0,0 +1,35 @@
+package org.openflow.protocol;
+
+/**
+ *  Base interface of all OpenFlow objects (e.g., messages, actions, stats, etc.)
+ *
+ *  All objects have a length and can be read and written from a buffer.
+ *  When writing, the length field is dynamically updated, so it need not be
+ *  managed manually.  However, you can override the auto calculated length with
+ *  overrideLength() call, if, for example, you want to intentionally create
+ *  malformed packets, for example, for negative testing.
+ */
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.openflow.exceptions.OFParseError;
+import org.openflow.exceptions.OFShortWrite;
+
+public interface OFObject {
+    /**
+     * Return a number equal or greater than zero (and currently in OF less than
+     * 65536)
+     *
+     * @return the number of bytes this object will represent on the wire
+     */
+    public int getLength();
+
+    /**
+     * Automatically calculate any lengths and write an openflow object into the
+     * byte buffer.
+     *
+     * @param bb
+     *            A valid byte buffer with sufficient capacity to hold this
+     *            object/
+     */
+    public void writeTo(ChannelBuffer bb) throws OFParseError, OFShortWrite;
+}