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Re: Immortal… ehm, frozen instances.
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Re: Immortal… ehm, frozen instances.

  • Subject: Re: Immortal… ehm, frozen instances.
  • From: Simon <email@hidden>
  • Date: Tue, 19 Mar 2013 20:24:41 +0000
...or you are touching the session object outside the RR loop. the classic gotcha is rendering a component in a thread that touches the session in some way e.g. delivering an email in a thread that uses a component to render it's content... been caught by that one soooo many times!


On 19 March 2013 17:51, Chuck Hill <email@hidden> wrote:
Hi Matteo,

You have one or more Zombie (aka Immortal) Sessions, as shown by stack traces like this:
"WorkerThread11" prio=10 tid=0x0000000041848800 nid=0x1010 in Object.wait() [0x00007f16f7cfa000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00000000d120b328> (a com.webobjects.appserver.WOSessionStore$TimeoutEntry)
        at java.lang.Object.wait(Object.java:485)
        at com.webobjects.appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java:191)
        - locked <0x00000000d120b328> (a com.webobjects.appserver.WOSessionStore$TimeoutEntry)
        at com.webobjects.appserver.WOApplication.restoreSessionWithID(WOApplication.java:1913)
        at er.extensions.appserver.ERXApplication.restoreSessionWithID(ERXApplication.java:2403)
        at er.extensions.appserver.ERXWOContext.existingSession(ERXWOContext.java:57)
        at er.extensions.appserver.ERXWOContext.hasSession(ERXWOContext.java:69)
        at com.webobjects.appserver.WOAction.existingSession(WOAction.java:190)
        at com.tla.calendar.DirectAction.goToAction(DirectAction.java:454)


This likely has one of two causes:
1. The application is getting OutOfMemory errors, which can leave the session store in an insane state
2. The app is throwing an exception from sleep() in Session.  If you overrride sleep() it should use a try...finally block

public void sleep() {
        try {
                // Your code here!
        } finally {
                super.sleep();
        }
}


Chuck



On 2013-03-19, at 9:38 AM, Altera WO Team wrote:

> Hi all,
>
> I'm having a strange issue on a WO installation on EC2 (oracle jvm).
> Same strange application which had immortal sessions…
>
> Sometimes (quite rarely) a bounced application (put in refuse new sessions) never quits and it's not accessible from JavaMonitor.
> If I look at the logs i see:
>
> Mar 19 12:38:52 B2C[2002] (ERXNSLogLog4jBridge.java:44) WARN  NSLog  - <com.tla.calendar.Application>: refusing new clients and below min active session threshold
> Mar 19 12:38:52 B2C[2002] (ERXNSLogLog4jBridge.java:44) WARN  NSLog  - <com.tla.calendar.Application>: about to terminate...
>
> The only thing left is to kill the instance… Which is not nice.
>
> I'm not overriding the terminate() method in Application.
>
> I am attaching a stack trace if it helps.
> <B2Cjstack.txt>
>
> Thanks,
>
>
>
> Matteo Centro
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  • Follow-Ups:
    • Re: Immortal… ehm, frozen instances.
      • From: Altera WO Team <email@hidden>
References: 
 >Immortal… ehm, frozen instances. (From: Altera WO Team <email@hidden>)
 >Re: Immortal… ehm, frozen instances. (From: Chuck Hill <email@hidden>)

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