Mailing-List: contact users-help@openjpa.apache.org; run by ezmlm
Precedence: bulk
Reply-To: users@openjpa.apache.org
Received-SPF: pass (nike.apache.org: domain of tglawles@us.ibm.com designates
 32.97.182.139 as permitted sender)
Subject: OpenJPA and JAXB
To: users@openjpa.apache.org
Message-ID: 
 <OF40443993.5F4DB1B8-ON85257611.00689CB4-85257611.006B29EB@us.ibm.com>
From: Thomas G Lawless <tglawles@us.ibm.com>
Date: Thu, 13 Aug 2009 15:30:30 -0400
MIME-Version: 1.0
Content-type: multipart/alternative;
	Boundary="0__=0ABBFC82DFFB1A248f9e8a93df938690918c0ABBFC82DFFB1A24"
Content-Disposition: inline

--0__=0ABBFC82DFFB1A248f9e8a93df938690918c0ABBFC82DFFB1A24
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: quoted-printable


I have been experimenting with OpenJPA and JAXB with regard to storing =
and
retrieving XML from an DB2 9.7 database and I've run into a problem.  I=
've
gone through the steps of creating a simple XML schema and generating t=
he
Java classes using xjc.  I have followed the steps in the OpenJPA manua=
l so
I have not defined a name space in the schema and I have added the
@XmlRootElement annotation to the generated root class.  I have created=

sample code that successfully creates an instance of my entity with the=

JAXB property and I can persist the entity to the database.  I can also=

retrieve the entity from the database and the XML is unmarshalled
successfully as long as I use a single instance of the EntityManager to=
 do
both tasks.  What I've found is if I use a separate instance on
EntityManager to retrieve the entity, I receive an error along the line=
 of
this:

org.apache.openjpa.persistence.PersistenceException:
javax.xml.bind.JAXBElement incompatible with.....

This only happens if I use a instance of EntityManager that is differen=
t
then the instance used to persist the original record.  For example, if=
 I
do the following:

EntityManagerFactory emFactory =3D .......
EntityManager em =3D emFactory............
em.getTransaction().begin();............
/*.
      Create the instance of the JAXB class and the entity.
      Populate both classes with data.
      Set the JAXB property of the entity class
*/

em.persist(.....);
em.getTransaction().commit();

MyEntity entity =3D em.find(.......);


The above code executes without error.  I've checked the db record and =
it
is correct.  I have also validated the XML in the db against the schema=

used to generate the JAXB classes and there are no issues there either.=
  If
I run another program that tries to retrieve the same entity as above..=
..
i.e.

EntityManagerFactory emFactory =3D .......
EntityManager em =3D emFactory...........

MyEntity entity =3D em.find(.......);....


the exception noted above is thrown.  I am currently using OpenJPA 1.2.=
1
and JAXB 2.0.5.  I have also tried this with JAXB 2.1.12 and I receive =
the
same result.  Am I doing something wrong?  Could this be a bug in OpenJ=
PA?=

--0__=0ABBFC82DFFB1A248f9e8a93df938690918c0ABBFC82DFFB1A24--