Questions Tagged With persistence

Adding additional Libraries to Hibernate, e.g. Envers

Alexis — Tue, 27 Jan 2015 17:05:26 -0500

Hello Ivy-Developers!

Envers is a powerfull Library, that comes along with the Hibernate-Package and allows auto-Auditing for entities. (History-Tables etc.)

Update:

To insert the library I did as following: Added hibernate-envers-4.2.13.Final.jar to ivy-Hibernate-jar:

designer\plugins\ch.ivyteam.hibernate_5.1.0.201409121008.jar\lib\mvn\

made some changes in the ivy-Hibernate-jar: ',lib/mvn/hibernate-envers-4.2.13.Final.jar' added to MANIFEST.MF

in pom.xml I inserted a new dependency for hibernate-envers (see pom.xml)

When inserting this library this unusual way, there are no more errors accessing the persistence.

Adding @Audited to the Entity gives no error, but no auditing happens on merge.(Wich would usualy be the case)

Merging through the EntityManager (from createEntityManager()) does not work (Nothing happens, no error)

Trying to access the AuditReader will fail on a ClassNotFoundException: org.hibernate.envers.AuditReaderFactory

// switching contextClassLoader to ivy.request.getProject().getProjectClassLoader()
EntityManager em = entityManager.createEntityManager();
AuditReaderFactory.get(em);

As I understand this has been successfully implemented in the csc project.

So the questions are: How can I integrate this library into Ivy? If not possible, is there a way to detach Hibernate more from Ivy?

Installation as described in: Guide from Hibernate

Thanks in advance!

Greetings Alexis

Persistence Api - Catching NoResultException

Alexis — Tue, 25 Nov 2014 16:35:41 -0500

Hello

How do I catch a NoResultException after calling the getSingleResult() on a custom query, wich often doesn't return any result. Catching the NoResultException still logs an error (NoResultException: No entity found for query) and after that the Info is printed out. Happens both in the designer and on the server.

catch (NoResultException e) {
    Ivy.log().info("No Result has been found for Debitor '"+number+"'.");
}

haven't tested yet with other Exceptions like NonUniqueResultException.

Thank you in advance

Composite Primary Key in Persistence

Alexis — Tue, 18 Nov 2014 15:00:16 -0500

Is there any way to have multiple ID's in one Entity? Corresponding JPA it should be possible. But trying in the designer I get: Exaclty one 'Id' field per Entity Class must be used. Although it is not named 'Id'. Would be saving a lot of work, when this is enabled.

Best Regards

Alexis

Not visible Interface on persistence query

Alexis — Tue, 09 Sep 2014 14:41:36 -0400

Calling a query on a table with BLOBs (Files in Tables) using the jTDS-Driver I get a class-loader error:

java.lang.IllegalArgumentException: interface org.hibernate.engine.jdbc.WrappedBlob is not visible from class loader

My Solution was to switch to an other classloader:

  public synchronized void method() {

        Thread thread = Thread.currentThread();
        ClassLoader tempLoader = thread.getContextClassLoader();
        thread.setContextClassLoader(null);

        entityManager.createNativeQuery("select * from TSRPTBLB where TSBID = 1 ")
                       .getSingleResult();

        thread.setContextClassLoader(tempLoader);
  }

Will there be any other, cleaner way than switsching the classloader?

Thank you in advance