Not that it necessarily needs to be fixed but in 5.0.1 you could serialize a package just using a regular ObjectOutputStream. Also the guy on the user mailing list was getting an exception using the DroolsObjectOutputStream.

From: rules-dev-bounces@lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: Friday, June 17, 2011 2:54 AM
To: Rules Dev List
Subject: [rules-dev] Today's Eleusinian mystery: deserializing a package forchange set monitoring

Serializing a compiled package seems a rational thing to do - after all, there is: <resource source="..." type="PKG" /> and it is recognized by the monitor.

However, you can't simply serialize an org.drools.definition.KnowledgePackage as it is usually done by writing it to an ObjectOutputStream: deserialization in the KnowledgeAgent throws a CCE exception.  To make it work, you must use a DroolsObjectOutputStream, which is nothing but a rename of ObjectOutputStream. So I have use DroolsObjectOutputStream, but it is not part of the public API.

-W