Re-hi, Thanks for your answers. I have tested with 2.3-SNAPSHOT and it still doesn't work... Although, the exception message is better "property /test/property: the property cannot be saved because it has been modified externally."
I do not understand why it should be an wanted behavior. Does Jackrabbit is designed to work with Node locks and Transaction only? There is no way to take the changes I've made in one Session and retry them? Based on my analysis : - Transaction would slow down the repository... - Locked nodes looks complicated and deadlock friendly since I need to modify properties at many place in the repository at once. - Retrying to get a new session and remake the changes when there was an error at session.save() looks like a dirty solution to me. Maybe there is something I did not understand with jackrabbit concurrency model. Any pointers? François Le 2010-12-13 à 4:33 AM, Stefan Guggisberg a écrit : > On Sat, Dec 11, 2010 at 11:52 AM, Norman Maurer <[email protected]> wrote: >> 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. > > sorry, but i have to contradict norman. > > the following behavior is as per design: > > 1. sessionA modifies a property > 2. sessionB modifies the same property and saves its changes > 3. sessionA tries to save its changes but fails with a > InvalidItemStateException because its changes have become stale > > this is the behavior as implemented in trunk. > > cheers > stefan > >> >> Bye, >> Norman >> >> >> >> >> 2010/12/11 François Cassistat <[email protected]>: >>> 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 >>>> >>> >>> >>
