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Re: Advise on deadlock
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Re: Advise on deadlock

  • Subject: Re: Advise on deadlock
  • From: Chuck Hill <email@hidden>
  • Date: Thu, 10 Jun 2010 13:03:00 -0700
Moving this to the correct list.


On Jun 10, 2010, at 12:54 PM, Ricardo J. Parada wrote:


We have one app that we just turned on concurrent request handling and we seem to get a deadlock. But I'm not sure why or what to do to fix it. :-)
This happens logging in to the application.

I'm using WO 5.4.3 and Wonder revision 10715.

Here's a stack trace of each thread (it looks like the deadlock is between WorkerThread13 and WorkerThread14:

No, both of those threads are waiting for a session that other threads have checked out (possibly the same thread). Either that thread is takinga long time or the session did not get checked back in.

Do you have any code the Session methods awake, sleep, or terminate?


Chuck




Jun 10 10:14:34 PatientPortionPricer[2013] FATAL er.extensions.statistics.ERXStatisticsStore - Request is taking too long, possible deadlock: 300294 ms

Request Thread Name: ERXStopWatchTimer

Java2D Disposer:
Thread[Java2D Disposer,10,main]:
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
WorkerThread13:
Thread[WorkerThread13,5,main]:
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Unknown Source)
at com .webobjects .appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java: 191)
at com .webobjects .appserver.WOApplication.restoreSessionWithID(WOApplication.java:1913)
at er .extensions .appserver.ERXApplication.restoreSessionWithID(ERXApplication.java: 2215)
at com .mpv .webapp .patientportionpricer .Application.restoreSessionWithID(Application.java:46)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedApplication(WOComponentRequestHandler.java:324)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._handleRequest(WOComponentRequestHandler.java:369)
at com .webobjects .appserver ._private .WOComponentRequestHandler .handleRequest(WOComponentRequestHandler.java:445)
at er.ajax.AjaxRequestHandler.handleRequest(AjaxRequestHandler.java:17)
at com .webobjects .appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
at er .extensions .appserver .ERXApplication.dispatchRequestImmediately(ERXApplication.java:1920)
at er .extensions .appserver.ERXApplication.dispatchRequest(ERXApplication.java:1885)
at com .webobjects .appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
at com .webobjects .appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
at java.lang.Thread.run(Unknown Source)
Session Timeout Thread:
Thread[Session Timeout Thread,5,main]:
at java.lang.Thread.sleep(Native Method)
at com.webobjects.appserver.WOSessionStore $_SessionTimeoutManager.run(WOSessionStore.java:98)
at java.lang.Thread.run(Unknown Source)
WorkerThread14:
Thread[WorkerThread14,5,main]:
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Unknown Source)
at com .webobjects .appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java: 191)
at com .webobjects .appserver.WOApplication.restoreSessionWithID(WOApplication.java:1913)
at er .extensions .appserver.ERXApplication.restoreSessionWithID(ERXApplication.java: 2215)
at com .mpv .webapp .patientportionpricer .Application.restoreSessionWithID(Application.java:46)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedApplication(WOComponentRequestHandler.java:324)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._handleRequest(WOComponentRequestHandler.java:369)
at com .webobjects .appserver ._private .WOComponentRequestHandler .handleRequest(WOComponentRequestHandler.java:445)
at er.ajax.AjaxRequestHandler.handleRequest(AjaxRequestHandler.java:17)
at com .webobjects .appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
at er .extensions .appserver .ERXApplication.dispatchRequestImmediately(ERXApplication.java:1920)
at er .extensions .appserver.ERXApplication.dispatchRequest(ERXApplication.java:1885)


Thanks,
Ricardo


--
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects







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