Hi, You may find these URLs relevant.. [1] http://n2.nabble.com/Fluid,-SDO-persistence-with-JPA-td2992382.html [2] http://people.apache.org/~ppoddar/fluid/site/welcome.html
Thomas G Lawless wrote: > > > > 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 the > Java classes using xjc. I have followed the steps in the OpenJPA manual > 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 different > then the instance used to persist the original record. For example, if I > do the following: > > EntityManagerFactory emFactory = ....... > EntityManager em = 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 = 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 = ....... > EntityManager em = emFactory........... > > MyEntity entity = 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 OpenJPA? > ----- Pinaki -- View this message in context: http://n2.nabble.com/OpenJPA-and-JAXB-tp3440312p3448776.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
