Unit test JPA Entities with in-memory Derby/JavaDB

HibernateAbout two years ago I blogged about using HSQLDB to unit test JPA entities. This year, Apache released a Derby version allowing you to use an in memory backend. As I use Derby in software I write, being able to run unit tests on the very same SGBD but in memory is a real gift.

For reference, here is a link to my previous post titled Unit test JPA Entities with in-memory database. What follows is just the very same method applied to Derby.

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Glassfish, Hibernate and WebServices – WSGEN Classpath

Java XMLFollowing my quick and dirty how-to about using hibernate in glassfish I came across a small pitfall when dealing with metro webservices.

The glassfish’s wsgen classpath on Glassfish is not by domain, ie. the wsgen tool is not run in the domain class-loader.

When trying to deploy a webservice that returns an entity with a hibernate annotation, I got this following error :

Deploy error

Server logs showed the following trace :

        warning: Cannot find annotation method 'value()' in type 'org.hibernate.annotations.Fetch':
        class file for org.hibernate.annotations.Fetch not found
Problem encountered during annotation processing;
see stacktrace below for more information.
        at com.sun.tools.ws.processor.modeler.annotation.WebServiceAP.isSubtype(WebServiceAP.java:360)
        ...... SNIP ......
        at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:223)
error: compilation failed, errors should have been reported
Exception occured in J2EEC Phase
com.sun.enterprise.deployment.backend.IASDeploymentException: WSGEN FAILED
        at com.sun.enterprise.webservice.WsUtil.genWSInfo(WsUtil.java:2

Adding the hibernate-annotations.jar file in the glassfish main lib/ directory added the necessary classes to the wsgen classpath.

Unit test JPA Entities with in-memory database

HibernateStill about Hibernate, I have several JPA Entities grouped in a Persistence Unit that I need to test. So here is another quick and dirty howto titled “Unit test JPA Entities with in-memory database”.

Here I assume you already have written your entities java classes with correct annotations.

As I’m working with embedded Derby for a year, I first tried with it but procton (thank you procton) pointed me to another lightweight RDBMS.

So, in this how-to we will set up a unit-tests dedicated persistence unit and use HSQLDB as in-memory database for unit tests.

UPDATE: now that Apache Derby provide an in memory backend, I implemented the very same thing with it in a new post : Unit test JPA Entities with in-memory Derby/JavaDB

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Quick and dirty howto : Use Hibernate in Glassfish V2


As Leon pointed in comments, it’s not a good idea to put the hibernate jars in the app server classpath like in this post. Hibernate community had published a howto explaining how to use Hibernate in Glassfish but the link has expired. Here is a copy from google cache:

To use hibernate with glassfish, all you have to do is put hibernate and its dependencies into your EAR file. This might also with with a WAR file.

In your persistence.xml, specify hibernate using this tag:


You can also specify hibernate properties as usual, for example:

<properties>  <property name=”hibernate.hbm2ddl.auto” value=”none”/></properties></blockquote>





For my first post here I’ll write a quick and dirty howto for using Hibernate inside the Glassfish V2 container.

  1. Download Hibernate projects
  2. Put’em in the domain’s lib dir
  3. Change your persistence.xml file
  4. Enjoy :)

Details are following :
Continue reading “Quick and dirty howto : Use Hibernate in Glassfish V2”