Hi,

I need some support with JBPM 6. I'm using the 6.2.0.Final version in a multi-threaded environment. I exposed some JBPM process services as rest services. I configured the runtime environment to be PER_PROCESS_INSTANCE. I have a problem when I try to retrieve the kie session; sometimes (it happens a couple of time in a day with nearly 1000 users working...), when the application executes the following code:

there's a lock that blocks the execution; below a stacktrace of the thread that remains locked:

service(HttpServletRequest, HttpServletResponse)

doPost(HttpServletRequest, HttpServletResponse)

processRequest(HttpServletRequest, HttpServletResponse)

doService(HttpServletRequest, HttpServletResponse)

doDispatch(HttpServletRequest, HttpServletResponse)

handle(HttpServletRequest, HttpServletResponse, Object)

handleInternal(HttpServletRequest, HttpServletResponse, HandlerMethod)

invokeHandleMethod(HttpServletRequest, HttpServletResponse, HandlerMethod)

invokeAndHandle(ServletWebRequest, ModelAndViewContainer, Object[])

invokeForRequest(NativeWebRequest, ModelAndViewContainer, Object[])

doInvoke(Object[])

invoke(Object, Object[])

invoke(Object, Object[])

invoke(Object, Object[])

completeTask(long, long, DocumentUpdate)

completeTaskByProcess(String, long, long, HashMap)

getKSession(Long)

getKieSession()

initKieSession(Context, InternalRuntimeManager, RuntimeEngine)

findKieSessionById(Long)

getConfiguration()

newKieSessionConfiguration(Properties, ClassLoader)

<init>(Properties, ClassLoader)

init(Properties, ClassLoader[])

<init>(String, ClassLoader)

<init>(String, ClassLoader, boolean)

getResources(String, ClassLoader)

getResources(String)

getResources(String)

getResources(String)

findResources(String, boolean)

getResources(String)

loadResourceLocal(String)

loadResourceLocal(String)

getResource(String)

doPrivileged(PrivilegedAction)

run()

run()

toURL()

getVirtualURL(VirtualFile)

getVirtualURI(VirtualFile)

getPathName(boolean)

isDirectory()

isDirectory(VirtualFile, VirtualFile)

doPrivileged(PrivilegedAction)

loadStatefulKnowledgeSession(Long, KieBase, KieSessionConfiguration, Environment)

loadKieSession(Long, KieBase, KieSessionConfiguration, Environment)

loadKieSession(Long, KieBase, KieSessionConfiguration, Environment)

buildCommandService(Long, KieBase, KieSessionConfiguration, Environment)

newInstance(Object[])

newInstance(Object[])

newInstance(Object[])

<init>(Long, KieBase, KieSessionConfiguration, Environment)

initExistingKnowledgeSession(Long, KieBase, KieSessionConfiguration, PersistenceContext)

loadSnapshot(byte[], KieSession)

unmarshall(InputStream, KieSessionConfiguration, Environment)

unmarshall(InputStream, KieSessionConfiguration, Environment)

readSession(MarshallerReaderContext, int, Environment, SessionConfiguration)

createAndInitializeSession(MarshallerReaderContext, int, Environment, SessionConfiguration, ProtobufMessages$KnowledgeSession)

createWorkingMemory(long, InternalKnowledgeBase, FactHandleFactory, InternalFactHandle, long, SessionConfiguration, InternalAgenda, Environment)

<init>(long, InternalKnowledgeBase, FactHandleFactory, InternalFactHandle, long, SessionConfiguration, InternalAgenda, Environment)

<init>(long, InternalKnowledgeBase, FactHandleFactory, boolean, long, SessionConfiguration, Environment, RuleRuntimeEventSupport, AgendaEventSupport, RuleEventListenerSupport, InternalAgenda)

createProcessRuntime()

newProcessRuntime(StatefulKnowledgeSessionImpl)

newProcessRuntime(InternalWorkingMemory)

newProcessRuntime(InternalWorkingMemory)

<init>(InternalWorkingMemory)

initProcessEventListeners()

addEventListener(KieBaseEventListener)

contains(Object)

containsKey(Object)

getEntry(Object)

It seems that the thread remain in wait in the following sychronized method of the AbstractEventSupport object in the contains call:

    public final synchronized void addEventListener(final E listener) {

        if (!this.listeners.contains(listener)) {

            this.listeners.add(listener);

        }

    }

Does anyone know anything about this issue???

Thanks

Dino