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 <[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 >> > >
