[jboss-jira] [JBoss JIRA] Commented: (JBAS-4441) Jboss hangs at startup with 100% CPU utilization

[Adrian Brock (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBAS-4441?page=comments#action_12363187 ] 
            
Adrian Brock commented on JBAS-4441:
------------------------------------

This issue is caused by JBAS-4066.

The classloader in 4.2.x now catches java.lang.LinkageError and assumes it is a spurious ClassCircularityError
caused by the JDK bug.

The problem is that with this broken configuration, the LinkageError is real.

There should be a maximum number of retries and then it should give up, e.g. 10 attempts?
There is a numCCE in the ClassLoadingTask but this is not currently maintained or used.

The suggested patch in LoadMgr3 would be something like:

      catch(Throwable e)
      {
         boolean retry = e instanceof ClassCircularityError
            || e.getClass().equals(LinkageError.class);
-         if( retry)
+         if( retry && loadTask.numCCE < 10)
         {
+          ++loadTask.numCEE;
            /* Reschedule this task after all existing tasks to allow the
            current load tasks which are conflicting to complete.
            */
etc.

> Jboss hangs at startup with 100% CPU utilization
> ------------------------------------------------
>
>                 Key: JBAS-4441
>                 URL: http://jira.jboss.com/jira/browse/JBAS-4441
>             Project: JBoss Application Server
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: ClassLoading
>    Affects Versions: JBossAS-4.2.0.GA
>         Environment: all
>            Reporter: Mikhail Grushinskiy
>         Assigned To: Scott M Stark
>
> Reproducable this way
> When seam application application.xml includes
> <module>
>   <java>jboss-el-api.jar</java>
> </module>
> See these threads for details:
> http://www.jboss.com/index.html?module=bb&op=viewtopic&t=108938&start=10&postdays=postDays&postorder=postOrder&highlight=highlight
> http://www.jboss.com/index.html?module=bb&op=viewtopic&t=109212&start=0&postdays=postDays&postorder=postOrder&highlight=highlight
> At least 4 people independently confirmed it (on windows and linux). It seems looping is hapenning in classloading code which migth indicate 
> more serious issue than just with seam applications.

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