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From Andrey Razumovsky <razumovsky.and...@gmail.com>
Subject Re: null pointer exception while committing new object.
Date Wed, 29 Jul 2009 07:11:29 GMT
Looks like some ObjAttribute does not have a correspoding DbAttribute. Check
that there are no validation problems when saving project in modeler. I'll
add better error message for that.
Misplaced spaces could have also cause problems, try to remove them and
commit.

2009/7/29 sridhar devatha <devatha.sridhar@gmail.com>

> i feel that modleler should truncate the spaces around the column names
> while generating sql queries and classes. I feel that exception
> message/trace is not thorough enought to pin point what column/ issue is
> causing the commit / insert to fail. I executed the insert manually, it is
> succeeded.  Only when I am going thru cayenne, it is getting failed. I feel
> that there is no other difference except a blank at the end of column name.
> As more and more packages/frameworks are being used to reduce time and
> improve automation and  productivity, it is important that
> logging/tracing/exception messages should be accurate , brief and complete
> so that we can quickly correct the issue.
>
> On Wed, Jul 29, 2009 at 11:45 AM, sridhar devatha <
> devatha.sridhar@gmail.com
> > wrote:
>
> > latest stable cayenne 2.x version. Part of the data map containing the
> > table and it's corresponding data object I will try to provide. But, as
> far
> > as i know, several other tables and data objects are proper. only thing
> is
> > that while creating table I accidentally modified some columns then I
> added
> > a space at the end of columns. But, I did not use the generated data
> object
> > class. Because I thought there is no other change. I think space at the
> end
> > of columns resulted in _ (underscore)being added to property names in the
> > generated data object. May be that is the same reason , even in map,
> extra
> > single blank space is added to the column names.I compared the two
> versions
> > of map files ignoring blanks. today I will compare without ignoring
> blanks.
> > Then I will see.
> > before committing i am creating a new object with new values. Nothing
> more
> > than that. it is standard creation operation.
> >   On Tue, Jul 28, 2009 at 11:09 PM, Andrey Razumovsky <
> > razumovsky.andrey@gmail.com> wrote:
> >
> >> 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
> >> >
> >>
> >
> >
> >
> > --
> >
> > Yours Sincerely,
> > Devatha Sridhar
> >
>
>
>
> --
>
> Yours Sincerely,
> Devatha Sridhar
>

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