Details
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Bug
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Resolution: Done
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Minor
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jBPM 5.3
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None
Description
Assuming a custom WorkItemHandler which wants to have a reference to ksession in jbpm-gwt-console-server.
public class MyWorkItemHandler implements WorkItemHandler { private StatefulKnowledgeSession ksession; public MyWorkItemHandler() { System.out.println("constructor : getting ksession"); ksession = org.jbpm.integration.console.StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession(); System.out.println("constructor : " + ksession); } ...
- Set up based on jBPM 5.3.0 installer
- Copy customworkitemhandler.jar to $JBOSS_HOME/standalone/deployments/jbpm-gwt-console-server.war/WEB-INF/lib
- Copy drools.session.conf and CustomWorkItemHandlers.conf to $JBOSS_HOME/standalone/deployments/jbpm-gwt-console-server.war/WEB-INF/classes/META-INF/
- Start JBoss AS
- Import repository_export_log_task.xml to Guvnor
- Go to http://localhost:8080/jbpm-console/ and login
You will see that StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession() returns null.
16:30:54,668 INFO [stdout] (http-localhost-127.0.0.1-8080-5) constructor : getting ksession 16:30:54,668 INFO [stdout] (http-localhost-127.0.0.1-8080-5) constructor : null
Daemon Thread [http-localhost-127.0.0.1-8080-3] (Suspended) StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession() line: 131 MyWorkItemHandler.<init>() line: 14 NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method] NativeConstructorAccessorImpl.newInstance(Object[]) line: 57 DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45 Constructor<T>.newInstance(Object...) line: 532 NewObjectNode.getReducedValue(Object, Object, VariableResolverFactory) line: 274 MVELInterpretedRuntime.parseAndExecuteInterpreted() line: 106 MVELInterpretedRuntime.parse() line: 49 MVEL.eval(String, Object, VariableResolverFactory) line: 150 InlineCollectionNode.execGraph(Object, Class, Object, VariableResolverFactory) line: 180 InlineCollectionNode.execGraph(Object, Class, Object, VariableResolverFactory) line: 138 InlineCollectionNode.getReducedValue(Object, Object, VariableResolverFactory) line: 105 MVELInterpretedRuntime.parseAndExecuteInterpreted() line: 106 MVELInterpretedRuntime.parse() line: 49 MVEL.eval(String, Map<String,Object>) line: 165 SessionConfiguration.loadWorkItemHandlers(String) line: 304 SessionConfiguration.initWorkItemHandlers() line: 294 SessionConfiguration.getWorkItemHandlers() line: 269 ReteooStatefulSession(AbstractWorkingMemory).getWorkItemManager() line: 1106 StatefulKnowledgeSessionImpl.getWorkItemManager() line: 311 SingleSessionCommandService$SynchronizationImpl.afterCompletion(int) line: 452 JtaTransactionSynchronizationAdapter.afterCompletion(int) line: 22 SynchronizationImple.afterCompletion(int) line: 117 AtomicAction(TwoPhaseCoordinator).afterCompletion(int, boolean) line: 403 AtomicAction(TwoPhaseCoordinator).end(boolean) line: 104 AtomicAction(AtomicAction).commit(boolean) line: 159 TransactionImple.commitAndDisassociate() line: 1159 UserTransactionImple(BaseTransaction).commit() line: 119 JtaTransactionManager.commit(boolean) line: 179 SingleSessionCommandService.<init>(Integer, KnowledgeBase, KnowledgeSessionConfiguration, Environment) line: 200 NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method] NativeConstructorAccessorImpl.newInstance(Object[]) line: 57 DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45 Constructor<T>.newInstance(Object...) line: 532 KnowledgeStoreServiceImpl.buildCommandService(Integer, KnowledgeBase, KnowledgeSessionConfiguration, Environment) line: 101 KnowledgeStoreServiceImpl.loadStatefulKnowledgeSession(int, KnowledgeBase, KnowledgeSessionConfiguration, Environment) line: 84 JPAKnowledgeService.loadStatefulKnowledgeSession(int, KnowledgeBase, KnowledgeSessionConfiguration, Environment) line: 131 StatefulKnowledgeSessionUtil.createOrLoadStatefulKnowledgeSession(KnowledgeBase) line: 281 StatefulKnowledgeSessionUtil.initializeStatefulKnowledgeSession() line: 154 StatefulKnowledgeSessionUtil$SessionHolder.<clinit>() line: 127 StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession() line: 131 TaskManagement(SessionInitializer).<init>() line: 25 TaskManagement.<init>() line: 51 ManagementFactory.createTaskManagement() line: 26 ManagementFactory.createTaskManagement() line: 19 TaskListFacade.getTaskManagement() line: 72 TaskListFacade.getTasksForIdRef(String) line: 101 ...
Actually, this happened in recursive calls of StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession() and SessionHolder.statefulKnowledgeSession was null at that time.
A workaround is calling StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession() in WorkItemHandler.executeWorkItem().
public void executeWorkItem(WorkItem workItem, WorkItemManager manager) { if (ksession == null) { System.out.println("executeWorkItem : getting ksession"); ksession = org.jbpm.integration.console.StatefulKnowledgeSessionUtil.getStatefulKnowledgeSession(); } System.out.println("executeWorkItem : " + ksession); ... }
