我使用JPA为我的DAO类编写测试,使用Hibernate作为JPA提供程序,以及Spring 3.2.我无法正确注入实体管理器,尝试访问它时会出现NullPointerException.我的GenericDAO实现如下所示:
@Repository
public class GenericDAOImpl implements GenericDAO {
@PersistenceContext(unitName="unitname")
private EntityManager entityManager;
public EntityManager getEntityManager() {
return entityManager;
}
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
// NullPointerException when calling this,entityManager is null
public Query createNamedQuery(String name) {
return entityManager.createNamedQuery(name);
}
// many other methods....
}
测试类看起来像这样:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "/com/main/resources/root-context.xml","/com/main/resources/servlet-context.xml"})
public class TestModel {
@Before
public void setUp() throws Exception{
...
}
@Test
public void test(){
...
}
}
我的root-context.xml如下:
spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
"
>
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