Re: NullPointerException only after first call to batchFetchRelationship
Re: NullPointerException only after first call to batchFetchRelationship
- Subject: Re: NullPointerException only after first call to batchFetchRelationship
- From: Kaj Hejer <email@hidden>
- Date: Sun, 14 Dec 2003 18:08:10 +0100
At 08:57 -0400 17-08-03, Lenny Marks wrote:
I have a direct action to render all information for a specified
'Manuscript' in our database. The rendering of this page traces deep into
the manuscript's relationships and was slow so I was attempting to use
EODatabaseContext.batchFetchRelationship to limit the hits to the
database. I added a method batchFetchManuscriptEvents(the root of the deep
relationships) to my Manuscript EOEnterpriseObject class. I was hoping
that the application could call this in anticipation of its particular
display needs. The method would batchFetch all the relationships so that
by the time the WOComponent was generating its response, all the
relationships would have already been faulted. This actually worked, but
only the first time the method is invoked on a Manuscript instance within
a single EOF stack. The first time I access the direct action for a
manuscript, it works, but if I hit reload I get the exception below.
Any clues would be greatly appreciated!
-Lenny Marks
<ManView>[2003-08-17 07:49:16 EDT] <Thread-6>
java.lang.NullPointerException
at
com.webobjects.eocontrol._EOMutableKnownKeyDictionary.<init>(_EOMutableKnownKeyDictionary.java:90)
at
com.webobjects.eoaccess.EORelationship._foreignKeyForSourceRow(EORelationship.java:1094)
Hi!
I now saw the same exception when using prefetching.
The stacktrace and the method where I get this exception can be found
at http://folk.uio.no/kajh/tmp/wo20031214.txt
Has anybody else here seen this?
The ec I use here is a childEC of session.defaulteditingContext and
this childEC has been locked.
I have only managed to reproduced this issue two times while testing
this application for about an hour, so it seems that it does not
appear so very often.
-Kaj :)
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