[jboss-jira] [JBoss JIRA] Closed: (JBAOP-500) Deadlock involving Interceptor Chain lock and class loading

Deadlock involving Interceptor Chain lock and class loading ----------------------------------------------------------- Key: JBAOP-500 URL: http://jira.jboss.com/jira/browse/JBAOP-500 Project: JBoss AOP Issue Type: Sub-task Security Level: Public(Everyone can see) Affects Versions: 2.0.0.CR2 Reporter: Flavia Rainone Assigned To: Flavia Rainone Fix For: 2.0.0.CR3 Attachments: threaddump2.txt This deadlock can be reproduced by running the rebuildingchain test (written to detect bug JBAOP-380) The scenario of this deadlock is the following: -Thread 0 (org.jboss.test.aop.rebuldingchain.SyncThread) When this thread calls the joinpoint SyncThread.checkStatus, its wrapper is executed. This wrapper needs to generate the Joinpoint class to do interception and, hence, acquires the lock for InterceptorChain read. As part of the generation fo the Joinpoint class, this class must be loaded. When the class loader loads this class, AOPTransformer is invoked. This class triggers the transformation of the class, which requires the AspectManager lock. - Thread 1 (org.jboss.test.aop.rebuildingchain.RebuildThread) This thread adds a binding to AspectManager. As part of the addBinding method execution, the AspectManager lock is acquired. As soon as the binding is addded to the bindings collection, the affect advisors have to rebuild their interceptor chains. SyncThread advisor is the affected advisor in this scenario and, to rebuild chains, it needs the write lock for the SyncThread.checkStatus inteceptor chain. This thread starts waiting for Thread0 to release the interceptor chain read lock. - Main Thread Waits for the other two threads to finish.