jBPM and LIE
I'm new to using jBPM and am trying to query the jBPM database objects.
I run a query that returns summary data containing the process and the number of tasks for the process. The summary data is displayed, however, the user then trys to click a process to display a list of tasks for that process, but receives a LazyInitializationException instead.
How can I make the jBPM Session behave in similar manner to the seam managed PC? Is there anyway to make jBPM use seams entity manager instead?
Any ideas on how to solve this problem would be greatly appreciated.
Cheers, Pete.
Named query called jbpm.getProcesses
SELECT count(t.processDefinition.id), t.processDefinition.id FROM org.jbpm.taskmgmt.exe.PooledActor pooledActor JOIN pooledActor.taskInstances ti JOIN ti.task t WHERE pooledActor.actorId in ( :actorIds ) AND ti.actorId is null AND ti.isSuspended != true AND ti.isOpen = true GROUP BY t.processDefinition.id
Code that is used in a summary process list:
public List<ProcessResult> getProcessSummary(List<String> pooledActorIds) {
org.hibernate.Query taskQuery = jbpmContext.getSession().getNamedQuery("jbpm.getProcesses") ;
taskQuery.setParameterList("actorIds", pooledActorIds) ;
List<ProcessResult> results = new ArrayList<ProcessResult>() ;
List<Object[]> queryResults = taskQuery.list() ;
for (Object[] result : queryResults) {
ProcessDefinition process = (ProcessDefinition) jbpmContext.getSession().load(ProcessDefinition.class, (Serializable)result[1]) ;
results.add(new ProcessResult((Long)result[0], process)) ;
}
return results ;
Code that causes a LIE
public Collection<Task> getTasksFromProcess(ProcessResult process) {
if (process != null) {
// next line causes LIE
Map<String, Task> tasks = (Map<String, Task>) process.getProcess().getTaskMgmtDefinition().getTasks() ;
return tasks.values() ;
} else {
return null;
}
}
The LIE in the log
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jbpm.graph.def.ProcessDefinition.definitions, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350) at org.hibernate.collection.AbstractPersistentCollection.readElementByIndex(AbstractPersistentCollection.java:151) at org.hibernate.collection.PersistentMap.get(PersistentMap.java:146) at org.jbpm.graph.def.ProcessDefinition.getDefinition(ProcessDefinition.java:431) at org.jbpm.graph.def.ProcessDefinition.getTaskMgmtDefinition(ProcessDefinition.java:444) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173) at org.jbpm.graph.def.ProcessDefinition_$$_javassist_95.getTaskMgmtDefinition(ProcessDefinition_$$_javassist_95.java) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion.getProcessSummary(JbpmExpansion.java:402) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion.addTaskNodes(JbpmExpansion.java:129) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion$$FastClassByCGLIB$$b998e405.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:45) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:57) at org.jboss.seam.interceptors.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:34) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:47) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:51) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:27) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:37) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:154) at org.jboss.seam.intercept.JavaBeanInterceptor.intercept(JavaBeanInterceptor.java:89) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion$$EnhancerByCGLIB$$9eed0613.addTaskNodes(<generated>) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion$JbpmType$3.addNodes(JbpmExpansion.java:68) at uk.co.iblocks.iflow.web.tree.expansion.JbpmExpansion.addNodes(JbpmExpansion.java:77) at uk.co.iblocks.iflow.web.TreeBean.exploreNode(TreeBean.java:270) at uk.co.iblocks.iflow.web.tree.TreeData$DebugNodeListener.exploreNode(TreeData.java:59) at uk.co.iblocks.iflow.web.tree.TreeData$DebugNodeListener.exploreNode(TreeData.java:59) at uk.co.iblocks.iflow.web.tree.TreeData$DebugNodeListener.exploreNode(TreeData.java:59) at uk.co.iblocks.iflow.web.tree.TreeData.setExpanded(TreeData.java:414) at com.icesoft.faces.component.tree.TreeRenderer.decode(TreeRenderer.java:109) at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:500) at com.icesoft.faces.component.tree.Tree.processDecodes(Tree.java:857) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIForm.processDecodes(UIForm.java:53) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:602) at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:135) at org.apache.myfaces.lifecycle.LifecycleImpl.applyRequestValues(LifecycleImpl.java:219) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:71) at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.renderCyclePartial(BlockingServlet.java:473) at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.receiveUpdates(BlockingServlet.java:442) at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.executeRequest(BlockingServlet.java:324) at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.service(BlockingServlet.java:186) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:393) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:619)
