[jboss-jira] [JBoss JIRA] (WFLY-3295) AsyncContext#start runs in caller thread

[Philippe Marschall (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-3295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Philippe Marschall updated WFLY-3295:
-------------------------------------

    Attachment: AsyncServlet.java


Consider the following code in the attached class

{code}
    CountDownLatch latch = new CountDownLatch(1);
    AsyncContext context = req.startAsync();
    LOG.info("sync work in" + Thread.currentThread().getName());
    context.start(() -> {
      LOG.info("async work in" + Thread.currentThread().getName());
      try {
        latch.await();
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        LOG.warning("interrupted");
      }
    });
    LOG.info("count down");
    latch.countDown();
{code}

If {{AsyncContext#start}} runs in a different thread (or the same thread just later) I would expect the following output:

* sync work indefault task-x
* count down
* async work indefault task-y

Instead I get:

* sync work indefault task-1
* async work indefault task-1
* nothing anymore since the runnable is executed in the caller thread
                
> AsyncContext#start runs in caller thread
> ----------------------------------------
>
>                 Key: WFLY-3295
>                 URL: https://issues.jboss.org/browse/WFLY-3295
>             Project: WildFly
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Web (Undertow)
>    Affects Versions: 8.1.0.CR1
>            Reporter: Philippe Marschall
>            Assignee: Stuart Douglas
>         Attachments: AsyncServlet.java
>
>
> {{javax.servlet.AsyncContext.start(Runnable)}} seems to run the runnable in the caller thread. In order for this method to be useful it should be run in a different thread.
> I'll attach a class to demonstrate the issue.

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