1 Reply Latest reply on Jan 29, 2013 3:30 PM by Randall Hauch

    DocumentAlreadyExistsException when creating node

    Emir Calabuch Newbie

      Hi,

       

      I'm using ModeShape 3.1.0.Final embedded in an application (repository cache backed by a JdbcStringCacheStore) deployed in JBoss 5.1.0.GA. Most of the JCR functionality works as advertised, but I'm facing issues doing a rather simple operation, adding a node to a newly added parent node. I'm using Jackrabbit's OCM for entity mapping, without problems for the most part except in this case.

       

      The operation I'm trying to perform is the following:

       

      if (getInstance().getPath() != null && getInstance().getPath().contains("/")) {
          String parent = getInstance().getPath().substring(0, getInstance().getPath().lastIndexOf("/"));
          JcrUtils.createPath(getContentManager().getSession(), parent);
      }
      getContentManager().insert(getInstance());
      getContentManager().save();
      

       

      JcrUtils.createPath() simply creates the parent nodes if they don't exist, starting from session.getRootNode() and calling node.addNode(pathSegment, "nt:unstructured") if a path segment does not exist. Finally I call the insert() method of OCM to perform the mapping and create the new node. ModeShape throws a DocumentAlreadyExistsException when calling save(). If I remove the createPath() call, ModeShape complains that the parent node does not exist (therefore I can exclude that the path already exists). Variable "parent" maps to "/comments/wiki/en/main", whereas the OCM is mapped into "/comments/wiki/en/main/comments".

       

      This is the exception's stacktrace:

       

      Caused by: org.apache.jackrabbit.ocm.exception.ObjectContentManagerException: Cannot persist current session changes.; nested exception is javax.jcr.InvalidItemStateException: This session tried to create node '/comments/wiki/en/main/comments' (with key '20ee2e990a8834167ee7cf-8841-4202-886e-74ce7c0b5c42'), but a node with that key already exists.
          at org.apache.jackrabbit.ocm.manager.impl.ObjectContentManagerImpl.save(ObjectContentManagerImpl.java:1078)
          at com.sample.core.dms.session.AbstractDmsHome.persist(AbstractDmsHome.java:127)
          at com.sample.core.dms.session.ForumMessageHome.persist(ForumMessageHome.java:36)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
          at java.lang.reflect.Method.invoke(Method.java:597)
          at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
          at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
          at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.bpm.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:51)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:97)
          at org.jboss.seam.util.Work.workInTransaction(Work.java:47)
          at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:91)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.EventInterceptor.aroundInvoke(EventInterceptor.java:52)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
          at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185)
          at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
          at com.sample.core.dms.session.ForumMessageHome_$$_javassist_seam_36.persist(ForumMessageHome_$$_javassist_seam_36.java)
          at com.sample.core.dms.session.ForumThreadHome.persist(ForumThreadHome.java:52)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
          at java.lang.reflect.Method.invoke(Method.java:597)
          at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
          at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
          at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.bpm.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:51)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:97)
          at org.jboss.seam.util.Work.workInTransaction(Work.java:47)
          at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:91)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.EventInterceptor.aroundInvoke(EventInterceptor.java:52)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
          at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
          at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
          at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185)
          at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
          at com.sample.core.dms.session.ForumThreadHome_$$_javassist_seam_34.persist(ForumThreadHome_$$_javassist_seam_34.java)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
          at java.lang.reflect.Method.invoke(Method.java:597)
          at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:335)
          at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:348)
          at org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58)
          at org.jboss.el.parser.AstValue.invoke(AstValue.java:96)
          at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
          at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
          at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
          ... 55 more
      Caused by: javax.jcr.InvalidItemStateException: This session tried to create node '/comments/wiki/en/main/comments'' (with key '20ee2e990a8834167ee7cf-8841-4202-886e-74ce7c0b5c42'), but a node with that key already exists.
          at org.modeshape.jcr.JcrSession.save(JcrSession.java:948)
          at org.apache.jackrabbit.ocm.manager.impl.ObjectContentManagerImpl.save(ObjectContentManagerImpl.java:1070)
          ... 119 more
      Caused by: org.modeshape.jcr.cache.DocumentAlreadyExistsException: 20ee2e990a8834167ee7cf-8841-4202-886e-74ce7c0b5c42
          at org.modeshape.jcr.cache.document.WritableSessionCache.persistChanges(WritableSessionCache.java:1036)
          at org.modeshape.jcr.cache.document.WritableSessionCache.save(WritableSessionCache.java:517)
          at org.modeshape.jcr.JcrSession.save(JcrSession.java:935)
          ... 120 more
      

       

      Is is possible to understand the reason of this behaviour? I use this mechanism elsewhere and have no problems.

       

      Thanks in advance.

        • 1. Re: DocumentAlreadyExistsException when creating node
          Randall Hauch Master

          That exception means that the node with key "20ee2e990a8834167ee7cf-8841-4202-886e-74ce7c0b5c42" couldn't be saved because there was already a document in the Infinispan cache with that exact key.

           

          Because ModeShape generates its own keys (and because IIRC there is no way for a client to specify the key that they'd like to use). This shouldn't be possible, but there must be a bug in how we're handling the saving of the session's transient state. Was the parent node somehow created, removed, and re-added to the session?

           

          Is it at all possible to create a small standalone test case that replicates this and that you'd be willing to share (at least privately, preferrably publicly)?

           

          Can you explain what the "insert(...)" method does?