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From Andrey Razumovsky <razumovsky.and...@gmail.com>
Subject Re: null pointer exception while committing new object.
Date Tue, 28 Jul 2009 17:39:09 GMT
What version of Cayenne are you using? Can we see the code you are
performing before committing the context? Could you show part of DataMap
declaration? Probably you are incorrectly registering persistent objects in
Cayenne context. I'm afraid information you are currently providing is not
enough to help you.

2009/7/28 sridhar devatha <devatha.sridhar@gmail.com>

> INFO  QueryLogger: Created connection pool:
> jdbc:derby://localhost:1527/empDB;create=false
>        Driver class: org.apache.derby.jdbc.ClientDriver
>        Min. connections in the pool: 1
>        Max. connections in the pool: 1
> INFO  QueryLogger: Opening connection:
> jdbc:derby://localhost:1527/empDB;create=false
>        Login: fsau
>        Password: *******
> INFO  QueryLogger: +++ Connecting: SUCCESS.
> INFO  QueryLogger: Detected and installed adapter:
> org.apache.cayenne.dba.derby.DerbyAdapter
> Exception in thread "main" java.lang.NullPointerException
>        at
>
> org.apache.cayenne.CayenneDataObject.validateForSave(CayenneDataObject.java:551)
>        at
>
> org.apache.cayenne.CayenneDataObject.validateForInsert(CayenneDataObject.java:658)
>        at
>
> org.apache.cayenne.access.ObjectStoreGraphDiff.validateAndCheckNoop(ObjectStoreGraphDiff.java:100)
>        at
> org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:1217)
>        at
> org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:1138)
>        at
> com.empApp.dao.impl.CayenneDAOImpl.commitChanges(CayenneDAOImpl.java:32)
>
> CayenneDAOImpl is as follows:
> public abstract class CayenneDAOImpl {
>    private DataContext dc  = null;
> /**
>     * Returns thread-bound DataContext.
>     */
>     protected synchronized DataContext getDataContext() {
>        try {
>            if(dc == null){
>                dc = DataContext.getThreadDataContext();
>            }
>        } catch(IllegalStateException ISE){
>            dc = DataContext.createDataContext();
>            DataContext.bindThreadDataContext(dc);
>        }
>        return dc;
>    }
>
>    synchronized protected void commitChanges(){
>        getDataContext().commitChanges();
>    }
>
> }
>
> On Tue, Jul 28, 2009 at 9:33 AM, Matt Kerr <matt@centralparksoftware.com
> >wrote:
>
> > any chance you have a stack trace ?
> > or code snippet ?
> > project even ?
> >
> > very hard to offer suggestion / debug
> > without more info :-?
> >
> > ok -thanks
> > -matt
> >
> >
> > On Mon, Jul 27, 2009 at 11:59 PM, sridhar
> > devatha<devatha.sridhar@gmail.com> wrote:
> > > Hi,
> > >
> > > I am getting null pointer exception while committing new object. I
> > committed
> > > several other objects of different classes using cayenne's
> > > datacontext.commitchanges. But, i am unable to commit this object.
> > >
> > > --
> > >
> > > Yours Sincerely,
> > > Sridhar
> > >
> >
>
>
>
> --
>
> Yours Sincerely,
> Devatha Sridhar
>

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