Hi, We have a legacy Drools application using 5.1 and we are planning to upgrade to 5.3. I have several questions: 1. Are org.drools.StatelessSession and RuleBase deprecated? and instead we should use KnowledgeBase and StatelessKnowledgeSession? 2. In 5.1.1, we extend WorkingMemoryLogger(final WorkingMemoryEventManager workingMemoryEventManager) , but it's changed to WorkingMemoryLogger(final WorkingMemory workingMemory) in 5.3, how do we change accordingly? Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/Upgrade-Drools-from-5-1-to-5-3-tp367287... Sent from the Drools: User forum mailing list archive at Nabble.com.