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From "Brett Connor (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1670) NPE when clustered JR queries version history on a node that has just had a version added by another JR in the same cluster
Date Mon, 07 Jul 2008 12:11:31 GMT
NPE when clustered JR queries version history on a node that has just had a version added by
another JR in the same cluster
---------------------------------------------------------------------------------------------------------------------------

                 Key: JCR-1670
                 URL: https://issues.apache.org/jira/browse/JCR-1670
             Project: Jackrabbit
          Issue Type: Bug
          Components: clustering
    Affects Versions: core 1.4.3
         Environment: Windows XP servers, JDK 1.5.2.02, in process. Microsoft SQL 2005 bundled
persistence manager, datastore.
            Reporter: Brett Connor
            Priority: Critical


Two computers A and B running jboss webapp, including in-process Jackrabbit instances in a
cluster.

- A checks out a versioned node, then checks it in and unlocks it
- A notifies B (through a non JR mechanism) that the node has been updated
- B finds the node (by UUID) and calls getVersionHistory().getAllVersions()

This results in java.lang.NullPointerException
	at org.apache.jackrabbit.core.version.VersionIteratorImpl.addVersion(VersionIteratorImpl.java:147)
	at org.apache.jackrabbit.core.version.VersionIteratorImpl. (VersionIteratorImpl.java:68)
	at org.apache.jackrabbit.core.version.VersionHistoryImpl.getAllVersions(VersionHistoryImpl.java:95)

The addVersion() method is synchronized, but looks like it's reading a null from 'successors'.

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