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From "Micah Whitacre (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1440) NPE Thrown when two Cluster Nodes are hitting the same underlying database.
Date Fri, 29 Feb 2008 14:48:51 GMT
NPE Thrown when two Cluster Nodes are hitting the same underlying database.

                 Key: JCR-1440
                 URL: https://issues.apache.org/jira/browse/JCR-1440
             Project: Jackrabbit
          Issue Type: Bug
    Affects Versions: core 1.4.1, 1.4
         Environment: Vista JDK 1.5.0_12.  Using Derby and Derby Client
            Reporter: Micah Whitacre
            Priority: Critical
         Attachments: SimpleJackRabbitTest.zip

I've created a test that creates two repositories with clustering enabled that are backed
by the same database.  Using the following workflow causes a NullPointerException to be thrown.

The workflow I'm using is:
The root node is versioned.
ClusterNode1 creates a versioned child node named "foo".
The test waits to make sure the syncDelay has passed so ClusterNode2 will notice the newly
created node.
ClusterNode2 retrieves the "foo" child node and removes it.
The test waits for the change ClusterNode1 to sync with that change.
ClusterNode1 tries to create another new node however a NullPointerException is thrown when
the it tries to checkout the rootNode.

java.lang.NullPointerException: null values not allowed
	at org.apache.commons.collections.map.AbstractReferenceMap.put(AbstractReferenceMap.java:251)
	at org.apache.jackrabbit.core.version.VersionManagerImpl.getItem(VersionManagerImpl.java:280)
	at org.apache.jackrabbit.core.version.XAVersionManager.getItem(XAVersionManager.java:334)
	at org.apache.jackrabbit.core.version.AbstractVersionManager.getVersion(AbstractVersionManager.java:87)
	at org.apache.jackrabbit.core.NodeImpl.getBaseVersion(NodeImpl.java:3198)
	at org.apache.jackrabbit.core.NodeImpl.checkout(NodeImpl.java:2991)
	at com.cerner.system.configuration.repository.jcr.SimpleJackrabbitConflictTest.testNullPointerExceptionThrown(SimpleJackrabbitConflictTest.java:96)

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