Hi,<br><br>a JCR session is not TS, you have to manage it by yourself. See below the chapter related the Thread-Safety in the JSR 170<br><br>7.5 Thread-Safety Requirements <br><br>A content repository implementation is required to provide a <br>

thread-safe implementation of all methods of <br>javax.jcr.Repository. <br><br>A content repository implementation is not required to provide <br>thread-safe implementations of other interfaces. As a consequence, <br>an application which concurrently or sequentially operates against <br>

objects having affinity to a particular <br>Session through more than <br>one thread must provide synchronization sufficient to ensure no <br>more than one thread concurrently operates against that <br>Session <br>and changes made by one thread are visible to other threads.<br>

<br><div class="gmail_quote">On Mon, Nov 8, 2010 at 8:52 PM, Matt Wringe <span dir="ltr">&lt;<a href="mailto:mwringe@redhat.com">mwringe@redhat.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">

Hi,<br>
<br>
We are seeing occasional ConcurrentModificationException when accessing<br>
certain portlets over wsrp. We already have a jira opened for this<br>
<a href="https://jira.jboss.org/browse/GTNWSRP-84" target="_blank">https://jira.jboss.org/browse/GTNWSRP-84</a><br>
<br>
The strange thing is that we have only been able to reproduce it on<br>
linux machines, it doesn&#39;t appear to be reproducible on mac machines.<br>
<br>
Has anyone seen issues like this before with respect to the jcr and<br>
concurrent modifications? Or a jcr expert have a better idea to what the<br>
issue is?<br>
<br>
It looks like the wsrp jcr layer needs a bit of work to make it more<br>
thread safe.<br>
<br>
&gt; Caused by: java.util.ConcurrentModificationException<br>
&gt;       at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)<br>
&gt;       at java.util.AbstractList$Itr.next(AbstractList.java:343)<br>
&gt;       at org.exoplatform.services.jcr.impl.core.SessionDataManager.validate(SessionDataManager.java:1421)<br>
&gt;       at org.exoplatform.services.jcr.impl.core.SessionDataManager.commit(SessionDataManager.java:1332)<br>
&gt;       at org.exoplatform.services.jcr.impl.core.ItemImpl.save(ItemImpl.java:681)<br>
&gt;       at org.exoplatform.services.jcr.impl.core.SessionImpl.save(SessionImpl.java:935)<br>
&gt;       at org.gatein.portal.wsrp.state.JCRPersister$WSRPSessionLifeCycle.save(JCRPersister.java:191)<br>
&gt;       at org.chromattic.core.jcr.SessionWrapperImpl.save(SessionWrapperImpl.java:263)<br>
&gt;       at org.chromattic.core.DomainSessionImpl._save(DomainSessionImpl.java:583)<br>
&gt;       at org.chromattic.core.DomainSession.save(DomainSession.java:146)<br>
&gt;       at org.chromattic.core.api.ChromatticSessionImpl.save(ChromatticSessionImpl.java:223)<br>
&gt;       at org.gatein.portal.wsrp.state.JCRPersister.closeSession(JCRPersister.java:111)<br>
&gt;       at org.gatein.portal.wsrp.state.consumer.JCRConsumerRegistry.update(JCRConsumerRegistry.java:116)<br>
&gt;       at org.gatein.wsrp.consumer.registry.AbstractConsumerRegistry.updateProducerInfo(AbstractConsumerRegistry.java:249)<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Nicolas Filotto<br>Project Leader JCR<br>eXo Platform SAS<br><a href="mailto:nicolas.filotto@exoplatform.com" target="_blank">nicolas.filotto@exoplatform.com</a><br>+33 (0)6 31 32 92 19  <br>