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From Norman Maurer <nor...@apache.org>
Subject Re: Item cannot be saved because it has been modified externally: node /
Date Sat, 11 Dec 2010 10:52:47 GMT
Hi there,

this is fixed in the upcomming jackrabbit 2.2.0 (which should be
released within the next days). In the meantime you can grab a
snapshot here:

https://repository.apache.org/content/groups/snapshots/org/apache/jackrabbit/

Version name is 2.2-SNAPSHOT.

Bye,
Norman




2010/12/11 François Cassistat <f@maya-systems.com>:
> I've managed to make some basic case that throws the error every time.
>
> import org.apache.jackrabbit.core.TransientRepository;
>
> import javax.jcr.*;
>
> public class JCRConcurrency
> {
>    public static void main(String[] args) throws RepositoryException
>    {
>        Repository repo;
>        if (args.length >= 2)
>            repo = new TransientRepository(args[0], args[1]);
>        else
>            repo = new TransientRepository();
>        SimpleCredentials simpleCredentials = new SimpleCredentials("username", "password".toCharArray());
>        Session sessionInit = repo.login(simpleCredentials);
>
>        // initialization
>        Node root = sessionInit.getRootNode();
>        Node test;
>        if (root.hasNode("test"))
>            test = root.getNode("test");
>        else
>            test = root.addNode("test");
>        if (!test.hasProperty("property"))
>            test.setProperty("property", 0);
>        sessionInit.save();
>        String testIdentifier = test.getIdentifier();
>
>        // session 1
>        Session session1 = repo.login(simpleCredentials);
>        Node test1 = session1.getNodeByIdentifier(testIdentifier);
>        System.out.println(test1.getProperty("property").getLong());
>        test1.setProperty("property", 1);
>
>        // session 2 is doing some other things at the same time
>        Session session2 = repo.login(simpleCredentials);
>        Node test2 = session2.getNodeByIdentifier(testIdentifier);
>        test2.setProperty("property", 2);
>
>        // session 2 saves first
>        session2.save();
>        session2.logout();
>
>        // session 1 saves
>        session1.save();
>        session1.logout();
>
>        sessionInit.logout();
>
>        System.exit(0);
>    }
> }
>
>
>
>
> Le 2010-12-10 à 6:12 PM, François Cassistat a écrit :
>
>> Hi list !
>>
>> I've got some concurrency problem while saving. My application use distinct Sessions
object and when two processes are trying to modify the same property of the same node at the
same time. I've get the exception below :
>> javax.jcr.InvalidItemStateException: Item cannot be saved because it has been modified
externally: node /
>>        at org.apache.jackrabbit.core.ItemImpl.getTransientStates(ItemImpl.java:249)
>>        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:981)
>>        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:920)
>>        at com.myproject.MyProject.save(MyProject.java:1525)
>>        ...
>>
>>
>> I have tried saving this way :
>> synchronized (this)
>> {
>>    session.refresh(true);
>>    session.save();
>> }
>>
>>
>> Is there any way around or only locks and transactions can prevent that ?
>>
>>
>> Thanks !
>>
>>
>> François
>>
>
>

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