Hi Group Members, In Drools 4.0.5 release most of the bugs with *"Working Memory serialization"* are fixed. But still the feature has few bugs. The bug scenario : 1. Create a rule Base & Working Memory (Stateful Session). 2. Assert some objects in Working Memory & call fireAll() 3. Serialize both Rule Base & Working Memory. 4. De Serialize Rule Base & Working Memory. 5. Remove Pkg/rule from Rule Base. 6. Serialize both Rule Base & Working Memory. 7. De Serialize Rule Base & Working Memory. --------->* In this step Working Memory De Serialization fails with java.lang.ClassNotFoundException. *8. Assert some more objects in Working Memory & call fireAll() I have tested the scenario using *"MarshallingTest.java"* from Drools Codebase. In the * MarshallingTest.testSerializeAddRemove_NoClassDefFoundError()* test case, I have appended bellow mentioned code snippet at end: ruleBase = (RuleBase) serializeIn( serializedRulebase ); session = ruleBase.newStatefulSession( new ByteArrayInputStream( serializedSession ) ); *// throws java.lang.ClassNotFoundExceptionException * results = (List) session.getGlobal( "results" ); InternalFactHandle stilton5 = (InternalFactHandle) session.insert( new Cheese( "stilton", 30 ) ); InternalFactHandle brie5 = (InternalFactHandle) session.insert( new Cheese( "brie", 30 ) ); InternalFactHandle bob7 = (InternalFactHandle) session.insert( new Person( "bob", 30 ) ); InternalFactHandle bob8 = (InternalFactHandle) session.insert( new Person( "bob", 40 ) ); session.fireAllRules(); assertEquals( 8, results.size() ); assertEquals( bob7.getObject(), results.get( 6 ) ); assertEquals( bob8.getObject(), results.get( 7 ) ); serializedSession = null; serializedRulebase = null; serializedSession = serializeOut( session ); serializedRulebase = serializeOut( ruleBase ); session.dispose(); *One more bug is:* Can not serialize Working Memory if Rule contains * Accumulate* or *Collect* Conditional element. Because, both of them have nested static class "*AccumulateMemory*" & "*CollectMemory*" respectively, which are not serializable. We want to use Drools in our project with its *"Working Memory serialization"* feature to maintain state of Rule Engine between executions. So Fix of All bugs related to *"Working Memory serialization"*feature is very important for us. Thanks Siddhartha _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev