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Date: Wed, 9 Dec 2009 09:26:20 +0000 (UTC)
From: "Luiz Fernando Teston (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
Subject: [jira] Created: (JCR-2428) When adding nodes inside a given node on
 different sessions distributed on different threads is throws
 InvalidItemStateException
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When adding nodes inside a given node on different sessions distributed on different threads is throws InvalidItemStateException
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                 Key: JCR-2428
                 URL: https://issues.apache.org/jira/browse/JCR-2428
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 1.6.0
         Environment: Mac OS X 10.6 with JDK 1.5 (yes, I downgraded this)
            Reporter: Luiz Fernando Teston


I just found an strange behavior while using multiple sessions on multi thread environment. I'd like to know if I did something wrong. 
My application code do this:
1 - before start to work, it creates a root node inside a new session. It saves and close this session.
2 - create a bunch of workers. Each worker has its own session.
3 - each worker adds nodes inside the root node retrieved by its session. It saves and do a logout properly.
4 - fill this workers on a list of Callables to be passed to an java 5 ThreadPoolExecutor.
5 - it executes all workers on the ThreadPool. 
6 - it do some asserts to verify if it gots some errors or not.

During phase 5 it gots an exception telling this:

javax.jcr.InvalidItemStateException: Item cannot be saved because it has been modified externally: node /
	at org.apache.jackrabbit.core.ItemImpl.getTransientStates(ItemImpl.java:245)
	at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:939)
	at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:915)

I just wrote a test to simulate this behavior. Sometimes it got this error sometimes not. Also to be easy to simulate this error, just change the THREAD_SIZE and NODE_SIZE variables.

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