Problems in serialization/deserialization of KnowledgePackages

Using DroolsStreamUtils, created an unit-test to serialize and deserialize a DRL file. In version "6.0.1.Final", the unit-test runs flawlessly. In other versions, deserialization gives an ClassNotFoundException for the declared event.

I've checked StackOverflow and Drools' JIRA for similar problems and found nothing.

I've also attached a junit. Please change property drools.version to test with different Drools versions.