RE: To severe things

[Chris Farnham <cf...@cra.com>]

Jan,

You may have already fixed your problem (1) detailed below but I thought
you may like to know that I had the exact same problem and I was able to
fix it.

I added 'deleteRule="Nullify"' to my 'Evidence->User' relationship which
seems very much like your Notiz->Person relationship.

	<obj-relationship name="user" source="EvidenceDAO"
deleteRule="Nullify"
		target="UserDAO" db-relationship-path="evidence_to_user"
/>

This change to the xml mapping file (which I maintain by hand) fixed the
NullPointerException I was receiving.

Christopher Farnham
Senior Software Engineer
Decision Management Division
cfarnham@cra.com
617.491.3474 x562

Charles River Analytics
625 Mount Auburn Street
Cambridge, MA 02138
http://www.cra.com
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-----Original Message-----
 
 

> From: Jan Lendholt [mailto:jlendholt@hotmail.com]
> Sent: Friday, September 14, 2007 7:59 AM
> To: user@cayenne.apache.org
> Subject: Re: To severe things
> 
> Hi Kevin,
> 
> To (1):
> 
> two snippets I can give you. Unfortunately we do not have a fitting
test
> case.
> 
> The "faulty" object is stored in a list and the delete via
> context.deleteObject:
> 
> //Thios expression fetches all persons that should be deleted from a
note
> Expression delExp =
> ExpressionFactory.matchExp(Mappingnotizperson.TO_NOTIZ_PROPERTY,
>
notiz.getObjectId()).andExp(ExpressionFactory.matchExp(Mappingnotizperso
n.
> TO_PERSONEN_PROPERTY,
> each.getObjectId()));
> 
> 						SelectQuery selQ = new
> SelectQuery(Mappingnotizperson.class,delExp);
> 
> //perform the query
> List<Mappingnotizperson> m = this.context.performQuery(selQ);
> //Delete the object
> this.context.deleteObject(m.get(0));
> this.context.commitChanges();
> 
> Now the corresponding object is marked as transient and is deleted.
> 
> //This refetches all persons that are assigned to one note.
> List<Mappingnotizperson> mapList =
> this.notiz.getMappingnotizpersonArray();
> 			System.err.println("notizid:"+
notizShow.getObjectId());
> 			for (Mappingnotizperson mappingnotizperson :
mapList) {
> 				System.err.println("mapp: pers-state:" +
> mappingnotizperson.getPersistenceState()); // + " --- persid:" +
> mappingnotizperson.getToPersonen());
> 
> 	this.persList.add(mappingnotizperson.getToPersonen()); //**
> 
> 	this.existPers.add(mappingnotizperson.getToPersonen());
> 			}
> 
> ** Here we get the NullPointerException that tells us, that the person
of
> this mapping is null.
> 
> Hope you can start with what we've got.
> 
> To (2):
> 
> We're using cayenne 2.0.3 with a customized db adapter to be used with
max
> db.
> 
> To me, the method prepareForAccess makes no sense.
> At first it's checked againstz being hollow and afterwards it's
checked
> against being commited - but how should it be commited when it's
already
> hollow??
> 
> Thanks in advance guys.
> 
> Jan
> 
> 
> 
> >From: Kevin Menard <km...@servprise.com>
> >Reply-To: user@cayenne.apache.org
> >To: <us...@cayenne.apache.org>
> >Subject: Re: To severe things
> >Date: Thu, 13 Sep 2007 15:21:52 -0400
> >
> >Hi Jan,
> >
> >I'm snipping out a lot of just to get to a few basic questions I
have.
> >
> >
> >On 9/13/07 1:25 PM, "Jan Lendholt" <jl...@hotmail.com> wrote:
> >
> > > Well, this exception comes on an object with the PersistenceState
=
> > > Transient. The exception is thrown when in doResolveFault cayenne
> tries
> >to
> > > access the object's context.
> > > But why? This object shouldn't even be there! In my opinion this
is a
> >bug.
> > > It doesn't matter, if we delete the object with deletObject or
with a
> >delet
> > > query. How can it be? It's pretty severe though.
> >
> >If possible, could you please post the code that seems to trigger the
> >error?
> >A small test case would be perfect, but showing anything would be
> helpful.
> >
> > > (2)
> > > I try to access a mapping table again, this time we manage
resources
> >like
> > > rooms, beamers etc.
> > >
> > > I get all mappings and try to access via
> >mapping.getToResource().getname()
> > > the resource's name.
> > >
> > > We get:
> > >
> > > 19:22:49.168 WARN!! Exception for /ams?serviceId=Echo.Synchronize
> > > org.apache.cayenne.FaultFailureException: [v.@CAYENNE_VERSION@
> > > @CAYENNE_BUILD_DATE@] Error resolving fault for ObjectId:
> > > <ObjectId:Resource, IDRESOURCE=1> and state (hollow). Possible
cause -
> > > matching row is missing from the database.
> >
> >What version of Cayenne are you actually using?
> >
> >--
> >Kevin
> >
> 
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