[Middlegen-user] JDO and EJB CMP

[G***@xcomp.com.au]

Hi All,

I'm not really clear on the advantages and disadvantages of JDO (as
generated by middlegen) to using EJBs with CMP (as generated by
middlegen). Any info would be appreciated ... I read somewhere that JDO
will not support scalability by default, but didn't find any details.

To try to understand further I wanted to try using JDO in the sample
application with middlegen. Is the JDO stuff with middlegen ready for
use?

I note that middlegen generates jdo/*Bean.java classes and also
generates xml *.jdo descriptors for the beans. Does anyone know how to
deploy this in JBoss? Once it is deployed, how do I use it?

thanks!

--
Glenn

[a***@netcom.no]

For an endless discussion about JDO and EJB:

http://www.theserverside.com/discussion/thread.jsp?thread_id=771

----- Original Message -----
From: ***@xcomp.com.au
Date: Tuesday, August 13, 2002 9:44 am
Subject: [Middlegen-user] JDO and EJB CMP

Post by G***@xcomp.com.au
Hi All,
I'm not really clear on the advantages and disadvantages of JDO (as
generated by middlegen) to using EJBs with CMP (as generated by
middlegen). Any info would be appreciated ... I read somewhere

Just to be clear. The CMPs and JDOs that Middlegen/XDoclet generate are
100% spec compliant. There is nothing Middlegen/XDoclet-specific about
them once they are generated.

Post by G***@xcomp.com.au
that JDO
will not support scalability by default, but didn't find any details.
To try to understand further I wanted to try using JDO in the sample
application with middlegen. Is the JDO stuff with middlegen ready for
use?

AFAIK, yes.

Post by G***@xcomp.com.au
I note that middlegen generates jdo/*Bean.java classes and also

Yes

Post by G***@xcomp.com.au
generates xml *.jdo descriptors for the beans. Does anyone know

No. XDoclet does that.

Post by G***@xcomp.com.au
how to
deploy this in JBoss? Once it is deployed, how do I use it?

You can't! JBoss doesn't have a JDO engine. -But you can find some
here:

http://www.jdocentral.com/

(I recommend LIBeLIS LiDO Community Edition to get you started with
JDO).

Aslak

Post by G***@xcomp.com.au
thanks!
--
Glenn
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