无法在JBoss AS 7中使用持久性("无法找到以子部署命名的部署单元")

Question

我尝试使用带有默认hibernate的JBoss AS 7和JBoss AS附带的默认数据库来实现一个演示.我的实现类似于JBoss的"登录"示例(我有一些额外的项目来实现Web服务并部署为EAR),我无法发现差异.无论如何,我经常得到运行时异常,例如

Caused by: java.lang.RuntimeException: Can't find a deployment unit named  at subdeployment "myproject.persistence.war" of deployment "myproject.ear"
    at org.jboss.as.weld.services.bootstrap.WeldJpaInjectionServices.getScopedPUName(WeldJpaInjectionServices.java:94) [jboss-as-weld-7.0.2.Final.jar:7.0.2.Final]
    at org.jboss.as.weld.services.bootstrap.WeldJpaInjectionServices.resolvePersistenceContext(WeldJpaInjectionServices.java:59) [jboss-as-weld-7.0.2.Final.jar:7.0.2.Final]
    at org.jboss.weld.util.Beans.injectEEFields(Beans.java:784) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]

我的MANIFEST.MF

Manifest-Version: 1.0
Dependencies: org.hibernate

我的beans.xml为空.在我的lib文件夹中,我有hibernate jar可以访问本机的hibernate功能.

我的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence 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_2_0.xsd"
    version="2.0">
    <persistence-unit name="accessControlDatabase">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>
        <properties>
            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
        </properties>
    </persistence-unit>
</persistence>  

我的两个相关课程:

import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

public class Resources {
    @SuppressWarnings("unused")
    @Produces
    @PersistenceContext(name = "accessControlDatabase")
    private EntityManager em;
}

import java.util.List;

import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityManager;

import myproject.model.Session;
import myproject.model.User;

@Named("accessControlRepository")
@RequestScoped
public class AccessControlRepository {
    @Inject
    private EntityManager em;

    @SuppressWarnings("unchecked")
    public List<Session> getAllSessions() {
        return em.createQuery("from Session").getResultList();
    }
}

什么可以导致例外？我应该寻找什么来解决这个问题？

Answer 1

我找到了解决方案.我必须将persistence.xml放入EAR项目的META-INF文件夹中.如果我这样做,我可以使用注释来获取.我认为它应该以另一种方式工作.这似乎是一种解决方法,而不是一个真正的解决方案.@PersistenceContextEntityManager