Re: Doubt....

[Falko Braeutigam <falko@smb-tec.com>]

On Thu, 08 Mar 2001, Priyaa wrote:
> Hello Sir,
> Thanks for your reply.
> As per your suggestion we tried after restarting the server. Still we get
> errors.

Please see the samples and the tutorial. You have to define a final static long
serialVersionUID in order to make the classes compatible. See also
http://java.sun.com/j2se/1.3/docs/guide/serialization/spec/serialTOC.doc.html


Falko

> 
> The Error Message is:
> ---------------------
> connected......
> exception
> org.ozoneDB.OzoneInternalExc: java.io.InvalidClassException: Car; Local
> class not compatible: stream classdesc serialVersionUID=7874274097213649505
> local class serialVersionUID=8780050788869226597
>         at
> org.ozoneDB.ExternalDatabase.sendCommand(ExternalDatabase.java:402)
>         at
> org.ozoneDB.ExternalDatabase.sendCommand(ExternalDatabase.java:376)
>         at
> org.ozoneDB.ExternalDatabase.objectForName(ExternalDatabase.java:635)
>         at MyApp.main(MyApp.java:21)
> 
> Thanx
> bye
> priyaa
> 
> 
> 
> 
> ----- Original Message -----
> From: Falko Braeutigam <falko@smb-tec.com>
> To: Priyaa <Priyaa@vdc.equadriga.com>; <ozone-users@ozone-db.org>
> Sent: Thursday, March 08, 2001 3:50 PM
> Subject: Re: Doubt....
> 
> 
> > On Thu, 08 Mar 2001, Priyaa wrote:
> > > >%_Hello,
> > >
> > > 1. If I change the class whose object is stored in the database, I am
> not
> > > able to access the database. But I could access it,  if I create the
> database
> > > again. What should be done to access the database without deleting it or
> Do we
> > > have some other way?
> >
> > It isn't possible to reload classes while the ozone JVM is running. If the
> > class file of a database class has changed you must restart (not recreate)
> the
> > server. This is indeed a drawback of the current version.
> >
> > > 2.  While storing the objects in the database, Is it not necessary to
> commit
> > > it?
> >
> > If you don't use explicit transaction demarcation (via
> ExternalTransaction),
> > then transactions are implicitly commited after each remote method
> invocation.
> >
> >
> > Falko
> > --
> > ______________________________________________________________________
> > Falko Braeutigam                              mailto:falko@smb-tec.com
> > SMB GmbH                                        http://www.smb-tec.com
> >
-- 
______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com