Can I start a ManagedThread in a Singleton Enterprise Java Bean?

Question

I'm trying to start a thread in a Singleton EJB but java.lang.IllegalStateException is being thrown. This is my (cut-down) class:

Singleton
@LocalBean
@Startup
public class WatcherEJB {


    @Resource(name = "concurrent/masterActionsThreadFactor")
    ManagedThreadFactory threadFactory;

    Thread watcherThread;

    @PostConstruct
    public void startUp() {

        //Setup the listener using the ThreadFactory
        watcherThread = threadFactory.newThread(new Runnable() {

            @Override
            public void run() {
                //System.out.println("Watcher Thread started");
            }
        });
        watcherThread.start(); //java.lang.IllegalStateException thrown here
    } 
}

I'm assuming that there's a problem with when I'm trying to start the Thread object or does Java EE 7 not allow Managed threads in singletons?

@perissf: Working with threads in the EJB container is discouraged in **JAVA EE 6 and prior**. In **JAVA EE 7** You can work with threads using `ManagedThreadFactory`, `ManagedExecutorService` and `ManagedScheduledExecutorService`. http://docs.oracle.com/javaee/7/tutorial/doc/concurrency-utilities.htm#GKJIQ8 — pWoz, Dec 09 '13 at 13:31
You are right. I have never worked on this yet. I am going to remove the comment. — perissf, Dec 09 '13 at 13:57

score 1 · Accepted Answer · answered Dec 09 '13 at 12:47

1

What application server do You use?

If it's WildFly You probably run into this issue: https://issues.jboss.org/browse/WFLY-2343

answered Dec 09 '13 at 12:47

pWoz

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It's Glassfish 4. Whilst I'm only a beginner in the field of Java 7 EE I cannot see a reason why this should not work. There is nothing I see in the docs to say what I am doing is prohibited. – D-Dᴙum Dec 09 '13 at 22:15
The issue you posted describes what I see too so it may not be implementation specific? – D-Dᴙum Dec 09 '13 at 22:23

score 1 · Answer 2 · edited May 23 '17 at 12:22

1

I came across this thread when looking for a solution and I thought that I would post this link to a thread which I believe answers the question. I know it has been a while since this question was asked but it should be useful for future reference!

Glassfish 4 - Using Concurrency API to create Managed Threads

edited May 23 '17 at 12:22

Community

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answered Mar 17 '15 at 09:44

Ed Mackenzie

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Can I start a ManagedThread in a Singleton Enterprise Java Bean?

2 Answers2

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