Marco Piraccini [http://community.jboss.org/people/mpiraccini] created the discussion "Weird problem with new JBPM 5.2 release" To view the discussion, visit: http://community.jboss.org/message/641348#641348 -------------------------------------------------------------- Hi, I have a very strange issue with the new JBPM 5.2 (with JPA persistence activated). In processes that end in the same call used to start the process  (for instance a process with only script task). In these case, indeed, I have this NPE: java.lang.NullPointerException     at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:172)     at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:138)     at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1079)     at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:306)     at org.drools.command.runtime.process.StartProcessCommand.execute(StartProcessCommand.java:119)     at org.drools.command.runtime.process.StartProcessCommand.execute(StartProcessCommand.java:38)     at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:345)     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:223) Debugging the JBPM code, it seems that in org.jbpm.process.instance.ProcessRuntimeImpl, when the process is started (and -subsequentially- ended), the Session reference goes to null (and then the NPE is thrown). The very same process definitions work well with JBPM 5.1 It's a regression? -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/641348#641348] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]