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From "Julian Reschke (Assigned) (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (JCR-3105) NPE when versioning operations are concurrent
Date Tue, 11 Oct 2011 09:45:11 GMT

     [ https://issues.apache.org/jira/browse/JCR-3105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Julian Reschke reassigned JCR-3105:
-----------------------------------

    Assignee: Julian Reschke
    
> NPE when versioning operations are concurrent
> ---------------------------------------------
>
>                 Key: JCR-3105
>                 URL: https://issues.apache.org/jira/browse/JCR-3105
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core
>            Reporter: Julian Reschke
>            Assignee: Julian Reschke
>         Attachments: JCR-3105.patch
>
>
> InternalVersionManagerBase.getParentNode occasionally throws an NPE:
>     protected static NodeStateEx getParentNode(NodeStateEx parent, String uuid, Name
interNT)
>             throws RepositoryException {
>         NodeStateEx n = parent;
>         for (int i = 0; i < 3; i++) {
>             Name name = getName(uuid.substring(i * 2, i * 2 + 2));
>             if (n.hasNode(name)) {
>                 n = n.getNode(name, 1);
>                 assert n != null;
>             } else if (interNT != null) {
>                 n.addNode(name, interNT, null, false);
>                 n.store();
>                 n = n.getNode(name, 1);
>                 assert n != null;
>             } else {
>                 return null;
>             }
>         }
>         return n;
>     }
> Apparently getNode occasionally returns null due to race conditions.
> Changing the code to what's below appears to fix it:
>     protected static NodeStateEx getParentNode(NodeStateEx parent, String uuid, Name
interNT)
>             throws RepositoryException {
>         NodeStateEx n = parent;
>         for (int i = 0; i < 3; i++) {
>             Name name = getName(uuid.substring(i * 2, i * 2 + 2));
>             NodeStateEx n2 = n.getNode(name, 1);
>             if (n2 != null) {
>                 n = n2;
>             } else if (interNT != null) {
>                 n2 = n.addNode(name, interNT, null, false);
>                 n.store();
>                 n = n2;
>             } else {
>                 return null;
>             }
>         }
>         return n;
>     }
> (but likely moves the race condition somewhere else)

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