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Date: Fri, 19 Jan 2007 07:02:29 -0800 (PST)
From: "Kevin Sutter (JIRA)" <jira@apache.org>
To: open-jpa-dev@incubator.apache.org
Subject: [jira] Commented: (OPENJPA-98) Java deadlock when insert in t1 and
 find in t2 when using IBM JVM 1.5.0
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    [ https://issues.apache.org/jira/browse/OPENJPA-98?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466068 ] 

Kevin Sutter commented on OPENJPA-98:
-------------------------------------

This looks to be a problem with the IBM JDK.  I reported the problem to IBM and I have just tested a possible fix for the problem.  So far, it looks good.  Since the original problem was intermittent, I guess I can't be sure that it's resolved.  But, after a couple days of testing, it looks to be standing up.  I am checking on the availability of a patch or updated version.

> Java deadlock when insert in t1 and find in t2 when using IBM JVM 1.5.0
> -----------------------------------------------------------------------
>
>                 Key: OPENJPA-98
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-98
>             Project: OpenJPA
>          Issue Type: Bug
>         Environment: OpenJPA:
> 0.9.6
> Java:
> java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build pwi32dev-20061002a (SR3)
> )
> IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-2006100
> 1 (JIT enabled)
> J9VM - 20060915_08260_lHdSMR
> JIT  - 20060908_1811_r8
> GC   - 20060906_AA)
> JCL  - 20061002
> DB:
> Derby 10.2.1.6
>            Reporter: Vlad Tatavu
>         Assigned To: Kevin Sutter
>         Attachments: console.txt, javacore.20070109.114312.3868.zip, play.zip
>
>
> I have a simple test program that uses OpenJPA 0.9.6 to insert an object into a db in one transaction (t1) and retrieve it in another transaction (t2).  The program hangs in 30-50% of the executions right before the call to entitymanager.find() (used to retrieve the object in t2).  I'm using OpenJPA runtime enhancement.
> By looking at the JVM dump, I can see the following deadlock:
> 1LKDEADLOCK    Deadlock detected !!!
> NULL           ---------------------
> NULL           
> 2LKDEADLOCKTHR  Thread "main" (0x0015EC00)
> 3LKDEADLOCKWTR    is waiting for:
> 4LKDEADLOCKMON      sys_mon_t:0x41E40548 infl_mon_t: 0x41E40588:
> 4LKDEADLOCKOBJ      java/lang/Object@00D41010/00D4101C: 
> 3LKDEADLOCKOWN    which is owned by:
> 2LKDEADLOCKTHR  Thread "Finalizer thread" (0x41B36200)
> 3LKDEADLOCKWTR    which is waiting for:
> 4LKDEADLOCKMON      sys_mon_t:0x0035CD38 infl_mon_t: 0x0035CD78:
> 4LKDEADLOCKOBJ      sun/misc/Launcher$AppClassLoader@00D4E5B0/00D4E5BC: 
> 3LKDEADLOCKOWN    which is owned by:
> 2LKDEADLOCKTHR  Thread "main" (0x0015EC00)

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