Persisting POJO entities defined in a different jar

[nbhatia]

I have an existing jar file containing POJO entities (no JPA annotations, no persistence.xml). I would like to persist there entities using a new EJB jar file which contains a persistence.xml and a mapping file. Is this possible? I tried it, but I am getting a InvalidMappingException:

Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource mappings.xml
 at org.hibernate.cfg.Configuration.addResource(Configuration.java:569)
 at org.hibernate.ejb.Ejb3Configuration.addClassesToSessionFactory(Ejb3Configuration.java:910)
 ... 101 more
Caused by: org.hibernate.AnnotationException: Unable to load class defined in XML: samples.estorejpa.domain.Customer
 at org.hibernate.cfg.AnnotationConfiguration.add(AnnotationConfiguration.java:592)
 at org.hibernate.cfg.AnnotationConfiguration.addInputStream(AnnotationConfiguration.java:674)
 at org.hibernate.cfg.Configuration.addResource(Configuration.java:566)
 ... 102 more
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: samples.estorejpa.domain.Customer
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:247)
 at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:112)
 at org.hibernate.reflection.java.JavaXFactory.classForName(JavaXFactory.java:153)
 at org.hibernate.cfg.AnnotationConfiguration.add(AnnotationConfiguration.java:589)
 ... 104 more

Here are the relevant files in my ear. estore-common-1.0.jar contains the POJO entities. estore-server-1.0.jar is the EJB jar that contains persistence.xml, mappings.xml and and a stateless session bean called OrderServiceBean. I was hoping that the POJO entity classes would be visible when parsing persistence.xml because they are in the classpath, but that does not seem to be true.

estore-1.0.ear
|---estore-common-1.0.jar
|---estore-server-1.0.jar
| |---mappings.xml
| |---META-INF
| | |---ejb-jar.xml
| | |---jboss.xml
| | `---persistence.xml
| `---samples
| `---estorejpa
| `---service
| |---OrderService.class
| `---OrderServiceBean.class
`---META-INF
 application.xml

Here's my persistence.xml:

<persistence>
 <persistence-unit name="EstorePersistenceUnit">
 <jta-data-source>java:/estore</jta-data-source>
 <mapping-file>mappings.xml</mapping-file>
 <properties>
 <property name="jboss.entity.manager.factory.jndi.name" value="java:/persistence-units/EstorePersistenceUnit"/>
 </properties>
 </persistence-unit>
</persistence>

Here's my mappings.xml:

<entity-mappings>
 <description>eStore JPA Mappings</description>
 <package>samples.estorejpa.domain</package>
 <entity class="samples.estorejpa.domain.Customer" name="Customer">
 <table name="CUSTOMER"/>
 <attributes>
 <id name="id">
 <generated-value/>
 </id>
 <basic name="version"/>
 <basic name="name"/>
 </attributes>
 </entity>
 ...
</entity-mappings>

Any help would be much appreciated.

Thanks.
Naresh

[jaikiran]

Please post the contents of your application.xml.

[nbhatia]

Here you go...

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC
 "-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
 "http://java.sun.com/dtd/application_1_3.dtd">
<application>
 <display-name>estore-app</display-name>
 <module>
 <ejb>estore-server-1.0.jar</ejb>
 </module>
</application>

[jaikiran]

estore-1.0.ear
|---estore-common-1.0.jar

Your estore-common-1.0.jar is not declared as a module in the application.xml and also its not in the default classpath of the EAR.

If you are using JBoss-4.2.x then create a lib folder at the root of the EAR and move the estore-common-1.0.jar to that folder:

estore-1.0.ear
 |
 |--- lib
 | |
 | |--- estore-common-1.0.jar

Or you can add a java module to the application.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC
 "-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
 "http://java.sun.com/dtd/application_1_3.dtd">
<application>
 <display-name>estore-app</display-name>
 <module>
 <java>estore-common-1.0.jar</java>
 </module>
 <module>
 <ejb>estore-server-1.0.jar</ejb>
 </module>
</application>

I would recommend the lib folder approach, since any jar in that folder will become available to the entire EAR.

[nbhatia]

That worked! Thanks a ton Jaikiran.