Thread deadlock on org.drools.util.CompositeClassLoader ------------------------------------------------------- Key: DROOLS-618 URL: https://issues.jboss.org/browse/DROOLS-618 Project: Drools Issue Type: Bug Affects Versions: 5.6.0.Final Environment: drools expert Reporter: Shashank Agarwal Assignee: Mark Proctor Attachments: http-54350-Processor15.txt, http-54350-Processor18.txt, http-54350-Processor20.txt Sometimes we are facing issues of thread deadlock due to which our application goes unresponsive. Drools version 5.6.0 Below is the deadlock statements detected by jconsole, also attached full tread dumps. There three threads are deadlocked triangularly. Name: http-54350-Processor15 State: BLOCKED on org.drools.rule.JavaDialectRuntimeData$PackageClassLoader@1d5787a owned by: http-54350-Processor18 Name: http-54350-Processor18 State: WAITING on java.util.concurrent.locks.ReentrantLock$NonfairSync@3cda324d owned by: http-54350-Processor15 Name: http-54350-Processor20 State: BLOCKED on org.drools.util.CompositeClassLoader@61269654 owned by: http-54350-Processor15 We do not have definite threads to re-produce the issue. But deadlocks are happening repeatedly on our production. Regarding out environment details: 1. We have windows box on which application runs. 2. The rules used are kept in .drl and .xls formats 3. Call StatefulKnowledgeSession session = base.newStatefulKnowledgeSession(); 4. Setup a few session globals as well.