[jira] Updated: (JCR-1359) Adding nodes from concurrently running sessions cause exceptions

["Jukka Zitting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JCR-1359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting updated JCR-1359:
-------------------------------

    Component/s: jackrabbit-core

Unfortunately I don't have a fix for this for jackrabbit-core 1.4.1. As a workaround until we have a proper fix I would recommend using some external synchronization mechanism in cases where you have heavy concurrent writes like this.

> Adding nodes from concurrently running sessions cause exceptions
> ----------------------------------------------------------------
>
>                 Key: JCR-1359
>                 URL: https://issues.apache.org/jira/browse/JCR-1359
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 1.3.3, 1.4
>            Reporter: Alexander Nesterov
>            Priority: Critical
>
> Exceptions are thrown when trying to add child nodes to one parent node from different sessions running concurrently. One of the following exceptions is always thrown:
>  * Exception in thread "Thread-8" java.lang.RuntimeException: javax.jcr.nodetype.ConstraintViolationException: /A/7 needs to be saved as well.
>  * Exception in thread "Thread-8" java.lang.RuntimeException: javax.jcr.RepositoryException: /A: unable to update item.: Unable to
> resolve path for item: 016b885a-64aa-45b9-a990-05cbabb4586f/{http://www.jcp.org/jcr/1.0}primaryType: Unable to resolve path for item: 016b885a-64aa-45b9-a990-05cbabb4586f/{http://www.jcp.org/jcr/1.0}primaryType
> According to JCR-584 "Improve handling of concurrent node modifications" the following scenario "session 1 adds or removes child node 'x', session 2 adds or removes child node 'y'" should run gracefully, but the following test constantly fails:
> public void testSync() throws Exception
> {
>        Node rootNode = getSession ().getRootNode ();
>        rootNode.addNode ("A");
>        rootNode.save();
>        final Session session1 = getRepository().login (new SimpleCredentials ("userName", "password".toCharArray()));
>        final Session session2 = getRepository().login (new SimpleCredentials ("userName", "password".toCharArray()));
>        Thread thread1 = new Thread (new Runnable()
>        {
>                public void run()
>                {
>                        try
>                        {
>                                addNodes ("A", session1, 0);
>                        }
>                        catch (RepositoryException ex)
>                        {
>                                throw new RuntimeException (ex);
>                        }
>                }
>        });
>        Thread thread2 = new Thread (new Runnable()
>        {
>                public void run()
>                {
>                        try
>                        {
>                                addNodes ("A", session2, 1001);
>                        }
>                        catch (RepositoryException ex)
>                        {
>                                throw new RuntimeException (ex);
>                        }
>                }
>        });
>        thread1.start();
>        thread2.start();
>        thread1.join();
>        thread2.join();
> }
> private void addNodes (String parentName, Session session, int startIndex)
>        throws RepositoryException
> {
>        Node parentNode = session.getRootNode().getNode (parentName);
>        for (int i = startIndex; i < startIndex + 100; i++)
>        {
>                String name = Integer.toString (i);
>                parentNode.addNode (name);
>                parentNode.save();
>        }
> }
> BTW: exceptions were also thrown when I tried to add nodes from one thread and remove some of them from another one. Each thread used it's own session, each node had unique name.

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