如何在jpa2应用程序中有多个持久性单元?

我的系统:

Eclipse/jpa2/jsf2.2/hibernate4/jbossas7

我的状况:

persistence.xml

Caused by: java.lang.IllegalArgumentException: JBAS011470: Persistence unitName was not specified and there are 2 persistence unit definitions in application deployment "test.war".  Either change the application to have only one persistence unit definition or specify the unitName for each reference to a persistence unit.
    at org.jboss.as.jpa.container.PersistenceUnitSearch.resolvePersistenceUnitSupplier(PersistenceUnitSearch.java:69)
    at org.jboss.as.jpa.processor.JPAAnnotationParseProcessor.getPersistenceUnit(JPAAnnotationParseProcessor.java:284)
    at org.jboss.as.jpa.processor.JPAAnnotationParseProcessor.getBindingSource(JPAAnnotationParseProcessor.java:220)
    at org.jboss.as.jpa.processor.JPAAnnotationParseProcessor.processField(JPAAnnotationParseProcessor.java:151)
    at org.jboss.as.jpa.processor.JPAAnnotationParseProcessor.processPersistenceAnnotations(JPAAnnotationParseProcessor.java:118)
    at org.jboss.as.jpa.processor.JPAAnnotationParseProcessor.deploy(JPAAnnotationParseProcessor.java:90)
    at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:113) [jboss-as-server-7.1.0.Final.jar:7.1.0.Final]
    ... 5 more

这个祖先类 没有 注入ou注释EntityManager,它是在第一次需要时由代码创建的,但是当我有多个PU时,上面的异常是由JBoss在应用程序启动时抛出的。

我在祖先中编写了一个代码来接受子类中的@PersistenceUnit注释,并在创建EntityManagerFactory时使用注释中设置的名称。当不使用注释时,代码会找出第一个PU名称并使用它。所以,第一个存在于 被理解为默认的PU名称。

然而,即使没有注入任何entitymanager,我仍然有上面的例外。