我尝试实现一个演示,它使用 JBoss AS 7 和 JBoss AS 附带的默认休眠和默认数据库。我的实现类似于 JBoss 中的“登录”示例(我有一些额外的项目来实现 Web 服务并部署为 EAR),但我看不出区别。无论如何,我不断收到运行时异常,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]
我的清单.MF
Manifest-Version: 1.0
Dependencies: org.hibernate
我的 beans.xml 是空的。在我的 lib 文件夹中,我有 hibernate jar 可以访问本机 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>
还有我的两个相关课程:
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();
}
}
什么会导致异常?我应该寻找什么来解决问题?