diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFErrorCauseData.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFErrorCauseData.java
new file mode 100644
index 0000000..b5c7af0
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFErrorCauseData.java
@@ -0,0 +1,121 @@
+package org.projectfloodlight.openflow.types;
+
+import java.util.Arrays;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.projectfloodlight.openflow.exceptions.OFParseError;
+import org.projectfloodlight.openflow.protocol.OFErrorMsg;
+import org.projectfloodlight.openflow.protocol.OFFactories;
+import org.projectfloodlight.openflow.protocol.OFFactory;
+import org.projectfloodlight.openflow.protocol.OFMessage;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+import org.projectfloodlight.openflow.protocol.Writeable;
+import org.projectfloodlight.openflow.util.ChannelUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Optional;
+import com.google.common.hash.PrimitiveSink;
+
+/** A special-purpose wrapper for the 'data' field in an {@link OFErrorMsg} message
+ *  that contains a byte serialization of the offending message.
+ *
+ *  This attempts to parse the offending message on demand, and if successful
+ *  will present the parsed message.
+ *
+ * @author Andreas Wundsam <andreas.wundsam@bigswitch.com>
+ */
+public class OFErrorCauseData implements Writeable, PrimitiveSinkable {
+    private static final Logger logger =
+            LoggerFactory.getLogger(OFErrorCauseData.class);
+
+    private final byte[] data;
+    private final OFVersion version;
+
+    private OFErrorCauseData(byte[] data, OFVersion version) {
+        this.data = data;
+        this.version = version;
+    }
+
+    public static OFErrorCauseData of(byte[] data, OFVersion version) {
+         return new OFErrorCauseData(Arrays.copyOf(data, data.length), version);
+    }
+
+    public byte[] getData() {
+        return Arrays.copyOf(data, data.length);
+    }
+
+    public Optional<OFMessage> getParsedMessage() {
+        OFFactory factory = OFFactories.getFactory(version);
+        try {
+            OFMessage msg = factory.getReader().readFrom(ChannelBuffers.wrappedBuffer(data));
+            if(msg != null)
+                return Optional.of(msg);
+            else
+                return Optional.absent();
+        } catch (OFParseError e) {
+            logger.debug("Error parsing error cause data as OFMessage: {}", e.getMessage(), e);
+            return Optional.absent();
+        }
+    }
+
+    public static OFErrorCauseData read(ChannelBuffer bb, int length, OFVersion version) {
+        byte[] bytes = ChannelUtils.readBytes(bb, length);
+        return of(bytes, version);
+   }
+
+    @Override
+    public void putTo(PrimitiveSink sink) {
+        sink.putBytes(data);
+    }
+
+    @Override
+    public void writeTo(ChannelBuffer bb) {
+        bb.writeBytes(data);
+    }
+
+   @Override
+   public String toString() {
+      Optional<OFMessage> parsedMessage = getParsedMessage();
+      if(parsedMessage.isPresent()) {
+          return String.valueOf(parsedMessage.get());
+      } else {
+          StringBuilder b = new StringBuilder();
+          b.append("[unparsed: ");
+          for(int i=0; i<data.length; i++) {
+              if(i>0)
+                  b.append(" ");
+              b.append(String.format("%02x", data[i]));
+          }
+          b.append("]");
+          return b.toString();
+      }
+   }
+
+   @Override
+   public int hashCode() {
+       final int prime = 31;
+       int result = 1;
+       result = prime * result + Arrays.hashCode(data);
+       result = prime * result + ((version == null) ? 0 : version.hashCode());
+       return result;
+   }
+
+   @Override
+   public boolean equals(Object obj) {
+       if (this == obj)
+           return true;
+       if (obj == null)
+           return false;
+       if (getClass() != obj.getClass())
+           return false;
+       OFErrorCauseData other = (OFErrorCauseData) obj;
+       if (!Arrays.equals(data, other.data))
+           return false;
+       if (version != other.version)
+           return false;
+       return true;
+   }
+
+}
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