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From Mat Lowery <mlow...@pentaho.com>
Subject NullPointerException during getBaseVersion
Date Mon, 18 Jul 2011 13:48:26 GMT
We are using Jackrabbit 1.6.0.  A user generated this stack trace recently:

java.lang.NullPointerException
at org.apache.jackrabbit.core.version.AbstractVersionManager.createInternalVersionItem(AbstractVersionManager.java:626)
at org.apache.jackrabbit.core.version.VersionManagerImpl.getItem(VersionManagerImpl.java:260)
at org.apache.jackrabbit.core.version.XAVersionManager.getItem(XAVersionManager.java:356)
at org.apache.jackrabbit.core.version.AbstractVersionManager.getVersion(AbstractVersionManager.java:86)
at org.apache.jackrabbit.core.NodeImpl.getBaseVersion(NodeImpl.java:3652)

Here's the code for createInternalVersionItem:

612    protected InternalVersionItem createInternalVersionItem(NodeId id)
613            throws RepositoryException {
614        try {
615            if (stateMgr.hasItemState(id)) {
616                NodeState state = (NodeState) stateMgr.getItemState(id);
617                NodeStateEx pNode = new NodeStateEx(stateMgr, ntReg, state, null);
618                NodeId parentId = pNode.getParentId();
619                InternalVersionItem parent = getItem(parentId);
620                Name ntName = state.getNodeTypeName();
621                if (ntName.equals(NameConstants.NT_FROZENNODE)) {
622                    return new InternalFrozenNodeImpl(this, pNode, parent);
623                } else if (ntName.equals(NameConstants.NT_VERSIONEDCHILD)) {
624                    return new InternalFrozenVHImpl(this, pNode, parent);
625                } else if (ntName.equals(NameConstants.NT_VERSION)) {
626                    return ((InternalVersionHistory) parent).getVersion(id);
627                } else if (ntName.equals(NameConstants.NT_VERSIONHISTORY)) {
628                    return new InternalVersionHistoryImpl(this, pNode);
629                } else {
630                    return null;
631                }
632            } else {
633                return null;
634            }
635        } catch (ItemStateException e) {
636            throw new RepositoryException(e);
637        }
638    }

Stepping through the code with a debugger shows that getItem(parentId)
returns null on line 619 because getItem calls createInternalVersionItem
which calls stateMgr.hasItemState(parentId) which returns false.  Anyone
have any idea how we got into this situation?

I found a couple of issues in JIRA but they are not the same stack trace:

https://issues.apache.org/jira/browse/JCR-2382
https://issues.apache.org/jira/browse/JCR-1440

Thanks.


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