topic Erros on Multiinstance Task in Alfresco Archive

Erros on Multiinstance Task

jerome_actility — Mon, 05 Sep 2016 07:51:14 GMT

Hi,I'm stuck with multi errors during multi instances task run. - Wildfly server - Activiti version : 5.21 - ManagedAsyncJobExecutor is used14:23:05,864 INFO [org.activiti.engine.impl.db.DbSqlSession] (default task-115) Upgrade needed: 52002 -> 52100. Looking for schema update resource for compo

Re: Erros on Multiinstance Task

jerome_actility — Mon, 05 Sep 2016 07:53:33 GMT

An Activiti consultant may be require to help us

Re: Erros on Multiinstance Task

jbarrez — Mon, 05 Sep 2016 16:57:47 GMT

Those are quite a bit of errors :s

> ActivitiLockingExeption on variable instance
Looking at the diagram, that could be because the workflow in platform 1 hasn't been committed to the DB yet. Ideally, you put something like a queue in front of it, that checks if the process instance is in a correct state before continuing the wait state.

> Null pointer exception
Looking at the offending line … no idea why this could happen … Does it happen always or is it sporadically?

> EJB lookup failed despite the Managed Executor Service

How/where are you doing an EJB lookup? Using managed or not executor should not matter I believe.

> HTTP response received before wait task block

Yes, which is related to the variable error above I think. You'll need to introduce some sort of queue that receives the message and only calls the API when the process instance is ready.
In v6, we added this http://blog.mark-it-zero.com/transaction-dependent-listeners/ to solve this issue (send out the http call on transaction committed).

Re: Erros on Multiinstance Task

jerome_actility — Wed, 07 Sep 2016 06:08:02 GMT

Thk for the reply,

> ActivitiLockingExeption on variable instance

I retrieve the execution list with this code:
<code>
List<Execution> executionList = bpmnEngine.getEngine().getRuntimeService().createExecutionQuery()
    .processInstanceId(processInstanceID)
    .activityId(taskName)
    .list();
</code>

Check if the list is empty or not. If empty, push the "processInstanceID" and the "taskName" to a queue and retry every 10 seconds.

How do i check the state ?
<code>execution.isSuspended() ??</code>

> Null pointer exception

It's sporadically but regularly

> EJB lookup failed despite the Managed Executor Service

EJB declaration, stateless or singleton:

<code>
@Stateless
@EJB(name="java:global/ProcessHistoryService", beanInterface=ProcessHistoryService.class)
public class ProcessHistoryService
</code>

or

<code>
@Startup
@Singleton
@EJB(name="java:global/SmpService", beanInterface=SmpService.class)
public class SmpService
</code>

We use EJB lookup with an Util class like this:

<code>
public static Object lookup(String name) {
        try {
            return InitialContext.doLookup("java:global/"+name);
        } catch (NamingException e) {
            throw new RuntimeException("lookup failed: java:global/"+name);
        }
    }
</code>

The result is either a "lookup failed" or "class cast exception"

<code>
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.executeJob(ExecuteAsyncRunnable.java:95)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:50)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.glassfish.enterprise.concurrent.ManagedThreadFactoryImpl$ManagedThread.run(ManagedThreadFactoryImpl.java:250)
Caused by: java.lang.RuntimeException: lookup failed: java:global/ProcessHistoryService
at com.actility.thingpark.activiti.ProgrammaticBeanLookup.lookup(ProgrammaticBeanLookup.java:55)
at com.actility.thingpark.activiti.ProgrammaticBeanLookup.lookup(ProgrammaticBeanLookup.java:48)
at com.actility.thingpark.smp.bpm.context.StateContext.flushState(StateContext.java:29)
at jdk.nashorn.internal.scripts.Script$1905$\^eval\_.rogram(<eval>:3)
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
</code>
My understanding of "ClasscastException" is my EJB are not load by the right class loader. It's strange, because its sporadic.

Re: Erros on Multiinstance Task

jerome_actility — Wed, 14 Sep 2016 09:53:22 GMT

@jbarrez

My reply it's enough to continue?