Hi, We are trying to evaluate what it takes to move from drools 5.4 to drools 6.0 There are some questions that I'd appreciate if someone clarifies after I've updated the code to use KieContainer instead of KnowledgeBase and successfully upgraded to drools 6.0.0-Beta3 1. Resolution of the imports: In previous versions (5.3/5.4) we were able to give import abc.def.* which would import all the model classes required by a .drl file, this doesn't seem to be valid anymore. Now we have to give a specific class name in every import statement so the 6.0 compiler is still able to use it. (eg) import abc.def.SomeCalss. Is that a change that was done to the compiler to resolve the imports, or is it just me? 2. Setting null values: Some rule in one of my drl files was of the form - delare SomeDate date : java.util.Date end rule "do something" when . . then insertLogical (new SomeDate(null)); end I'm assuming the compiler is calling the java.util.Date constructor which shouldn't allow you to create a date with null being passed to the constructor. This was ok with the previous versions (upto 5.4) and now throws a NPE in 5.5 and 6.0. I'd think this should actually be throwing an IllegalArgumentException with Date but throws a NPE instead. Is that true? Is the drools compiler now catching that llegalArgumentException and throwing a org.kie.api.runtime.rule.ConsequenceException due to null Date? 3. KieContainerImpl not serialized: as session creation is very light, so it is recommended that KnowledgeBases be cached where possible to allow for repeated session creation. We could achieve this using the EhCache and caching Knowledgebase objects. We cannot do the same with KieContainer since it throws a SerializationException with KieContainerImpl is not Serializable. So seems like we cannot cache these KieCaontainer objects? Or is there some other way to do that? 4. Release date for 6.0-Final: What does the roadmap look like for the 6.0-Final? Thanks. -- View this message in context: http://drools.46999.n3.nabble.com/Upgrading-to-Drools-6-0-questions-Gener... Sent from the Drools: User forum mailing list archive at Nabble.com.