Hello,
I have problems with adding child nodes to one parent node from
different sessions running in concurrent threads.
I've wrote a test which creates two sessions and launches two threads
used to add nodes to the same parent node. The names of child nodes
are unique. 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 my test constantly fails with various exceptions like:
Exception in thread "Thread-8" java.lang.RuntimeException:
javax.jcr.nodetype.ConstraintViolationException: /A/7 needs to be
saved as well.
or
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
The code of my test is the following:
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();
}
}
The test fails both on Jackrabbit 1.3.3 and 1.4.
Do I get something wrong or is it a bug in Jackrabbit?
TIA,
--
Alexander Nesterov
