Multiple PUs in a single persistence.xml

Question

Hi,
I'm trying to define two different PUs for a standalone and Java EE environments, so a single persistence.xml could be used.
Here goes the persistence.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
  <persistence-unit name="derbyPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
    <class>pl.jaceklaskowski.jsf.tomahawk.entities.Pracownik</class>
    <properties>
      <property name="openjpa.ConnectionDriverName" value="org.apache.derby.jdbc.EmbeddedDriver" />
      <property name="openjpa.ConnectionURL" value="jdbc:derby:target/derbyDB;create=true" />
      <property name="openjpa.ConnectionUserName" value="app" />
      <property name="openjpa.ConnectionPassword" value="app" />
      <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema" />
      <property name="openjpa.Log" value="DefaultLevel=WARN,SQL=TRACE" />
    </properties>
  </persistence-unit>
  <persistence-unit name="Kadry">
    <jta-data-source>jdbc/derby</jta-data-source>
    <class>pl.jaceklaskowski.jsf.tomahawk.entities.Pracownik</class>
  </persistence-unit>
</persistence>and here goes the managed bean of a JSF application I'm developing.
package pl.jaceklaskowski.jsf.tomahawk;
import java.util.List;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
public class Pracownicy {
    @PersistenceContext(name="Kadry")
    EntityManager em;
    DataModel pracownicy = new ListDataModel();
    public DataModel getLista() {
        List resultList = em.createQuery("SELECT p FROM Pracownik p ORDER BY p.lastName").getResultList();;
        pracownicy.setWrappedData(resultList);
        return pracownicy;
}When I run it on GF v2b36 I'm getting the following exception:
com.sun.enterprise.deployment.backend.IASDeploymentException: Deployment Error -- Could not resolve a persistence unit corresponding to the persistence-context-ref-name [Kadry] in the scope of the module called [C:\projs\myfaces-tomahawk\target\myfaces-tomahawk]. Please verify your application.
        at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUsViaPCRefs(BundleDescriptor.java:689)
        at com.sun.enterprise.deployment.WebBundleDescriptor.findReferencedPUs(WebBundleDescriptor.java:709)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.getAllPersistenceUnitDescriptors(PersistenceProcessor.java:158)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.processApplication(PersistenceProcessor.java:119)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.processApplication(DeploymentEventListenerImpl.java:198)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.processEvent(DeploymentEventListenerImpl.java:159)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.notifyDeploymentEvent(DeploymentEventListenerImpl.java:109)
        at com.sun.enterprise.deployment.backend.DeploymentEventManager.notifyDeploymentEvent(DeploymentEventManager.java:66)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.handlePostDeployEvent(ModuleDeployer.java:618)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.postDeploy(ModuleDeployer.java:607)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.doRequestFinish(ModuleDeployer.java:172)
        at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:174)
        at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:95)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:892)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:266)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:761)
        at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:174)
        at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:210)I double-checked that the jar with the Kadry PU is in WEB-INF/lib directory of the web application.
Does anyone have any idea what might be wrong?
Jacek
Jacek Laskowski
http://www.jaceklaskowski.pl

Answer 1

Hi Jacek,
The attribute you should set is unitName(), not name(). name() defines the location of the
@PersistenceContext dependency within the component environment (java:comp/env). It
is independent of the dependency type and appears on all Java EE environment annotations :
@EJB, @Resource, etc.
unitName() specifies the name of the associated persistence unit. If there is only one defined it's
not needed. However, in your case there are two so since it's not specified there isn't enough
information to resolve the correct one.
--ken