exception in ContextCommit

From: Bryan Lewis (brya..aine.rr.com)
Date: Thu Oct 14 2004 - 12:16:07 EDT

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    I'm getting a NullPointerException in version 1.1-RC1.

    org.objectstyle.cayenne.access.ContextCommit.appendOptimisticLockingAttributes(ContextCommit.java:564)

    org.objectstyle.cayenne.access.ContextCommit.prepareUpdateQueries(ContextCommit.java:426)

    org.objectstyle.cayenne.access.ContextCommit.commit(ContextCommit.java:156)
    org.objectstyle.cayenne.access.DataContext.commitChanges(DataContext.java:1231)

    org.objectstyle.cayenne.access.DataContext.commitChanges(DataContext.java:1201)

    I've stepped through the code; the snapshot being retrieved at line 556
    is null, causing the exception a few lines later in snapshot.get(name).

    The DataObject is a normal object with state = modified; a new object is
    being added to its to-many relationship. There's only one DataContext in
    use. If I tell the Modeler not to use optimistic locking for the
    modified object, the exception doesn't happen because
    appendOptimisticLockingAttributes() isn't called.

    I copied the snapshot-getting line 556 to my own code for an experiment.
    If I replace getRetainedSnapshot() with getSnapshot(objectId,
    dataContext), a non-null snapshot is returned. That might not be the
    right solution... I just wanted to confirm that the null result was
    coming from getRetainedSnapshot().

    This archive was generated by hypermail 2.0.0 : Thu Oct 14 2004 - 12:16:31 EDT