Re: NullPointerException in many-many relationship cross two models
Re: NullPointerException in many-many relationship cross two models
- Subject: Re: NullPointerException in many-many relationship cross two models
- From: Chuck Hill <email@hidden>
- Date: Mon, 14 Dec 2009 19:17:30 -0800
Both models need to have the exact (and I _do_ mean _exact_) same
connection dictionary. The dictionaries must be equals(). This is
most easily accomplished by setting the programatically when the app
loads. Wonder, of course, does this.
Chuck
On Dec 14, 2009, at 3:30 PM, Ren, Kevin wrote:
Hi,
There is m-m relationship between A and B entities which are in
different models, but in same database. I can create and platen this
relationship in EOModler and got AB table as well.
AB is in the same DB and only has compound PK like A_ID and B_ID.
When I tried to do saveChanges got this error
[2009-12-15 12:6:48 NZDT] <WorkerThread0>
java.lang.NullPointerException
at
com
.webobjects
.eoaccess
.EODatabaseContext
.primaryKeyForIntermediateRowFromSourceObject(EODatabaseContext.java:
4845)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.databaseOperationForIntermediateRowFromSourceObject
(EODatabaseContext.java:4863)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.recordInsertForIntermediateRowFromSourceObject
(EODatabaseContext.java:4888)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.relayAttributesInRelationshipSourceObjectDestinationObject
(EODatabaseContext.java:4913)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.relayAttributesInRelationshipSourceObjectDestinationObjects
(EODatabaseContext.java:4966)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.recordChangesInEditingContext(EODatabaseContext.java:6036)
at
com
.webobjects
.eocontrol
.EOObjectStoreCoordinator
.saveChangesInEditingContext(EOObjectStoreCoordinator.java:373)
at
com
.webobjects
.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3192)
And I found only updateObjects could has two entities's details and
insertedObjects does not print out anything.
Not sure this does not work in across models or something else need
setup?
thanks
Xiaowen(Kevin) Ren
Analyst Programmer
Channel Applications, Retail Applications
ANZ National Bank Ltd
Level 6 ASB Tower
2 Hunter Street
PO Box 1791
Wellington
Phone: 04 4365363
Fax: 04 8028696
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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