>From time to time, org.datanucleus.store.appengine.DatastoreTable throws a
NullPointerException, and I have not yet figured out why or what is the
pattern, just a few first requests fail and then all goes well.
The exact line where the exception is thrown is 569:
// Run callbacks for each of the element classes.
for (AbstractClassMetaData elementCmd1 : elementCmds) {
callbacks.put(elementCmd1.getFullClassName(),
new CallBack(fmd, cmd.getFullClassName()));
DatastoreTable dt =
(DatastoreTable) storeMgr
.getDatastoreClass(elementCmd1.getFullClassName(), clr);
dt.runCallBacks(); // This line throws java.lang.NullPointerException from
time to time
if (fmd.getMappedBy() != null) {
// This element type has a many-to-one pointing back.
// We assume that our pk is part of the pk of the element type.
dt.markFieldAsParentKeyProvider(fmd.getMappedBy());
}
}
Anyone has an idea why this happens?
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