我通过注释遇到弹簧DI的问题,这是我的应用程序:
@Service
public class Test {
@Autowired
private GpsPointEntityDao gpsPointEntityDao;
public void test() {
if (gpsPointEntityDao == null)
System.out.println("It's null!\n" + gpsPointEntityDao);
}
}
通用接口:
public interface GenericDao<T extends DomainObject> {
public T find(long id);
public List<T> getAll();
public void save(T object) throws DataAccessException;
public void delete(T object) throws DataAccessException;
}
具体界面:
public interface GpsPointEntityDao extends GenericDao<GpsPointEntity> {}
抽象实现:
abstract class AbstractGenericDaoJpa<T extends DomainObject> implements GenericDao<T> {
private final Class<T> entityType;
protected EntityManager entityManager;
public AbstractGenericDaoJpa() {
this.entityType = (Class<T>) GenericTypeResolver.resolveTypeArgument(getClass(), GenericDao.class);
}
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
@Transactional
@Override
public T find(long id) {
return entityManager.find(entityType, id);
}
@Transactional
@Override
public List<T> getAll() {
return entityManager.createQuery("SELECT e FROM " + entityType.getName() + " e").getResultList();
}
@Transactional
@Override
public void save(T object) throws DataAccessException {
entityManager.persist(object);
}
@Transactional
@Override
public void delete(T object) throws DataAccessException {
entityManager.remove(object);
}
}
具体课程:
@Repository
public class GpsPointEntityDaoJpa extends AbstractGenericDaoJpa<GpsPointEntity> implements GpsPointEntityDao {}
我的appcontext:
<context:component-scan base-package="com.test"/>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="basicDataSource"/>
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager"
p:entityManagerFactory-ref="entityManagerFactory"/>
<tx:annotation-driven mode="proxy" transaction-manager="transactionManager"/>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
应用程序的结果是:
它是空的!
我一整天都在寻找问题,但没有成功。有人看到问题的地方吗?
我在日志中找到了这条消息:
INFO org.springframework.context.support.ClassPathXmlApplicationContext - Bean 'entityManagerFactory' of type [class org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
答案 0 :(得分:5)
我没有看到问题。使用大致相同的代码,我运行了这个:
public static void main(String[] args) {
Test bean = new ClassPathXmlApplicationContext("/applicationContext.xml").getBean(Test.class);
bean.test();
}
正确注入了测试bean。如果你想看一下,我可以让我的测试项目可用。您确定要获得Test的注入版本吗?你是如何获得的?
编辑:您的实例未被注入,因为您自己实例化它而不是让Spring执行此操作。除非你use AspectJ to inject objects,否则Spring只能 注入它正在管理的对象。当你调用new Test()
时,你没有从Spring获取实例,而Spring对你创建的实例一无所知。
答案 1 :(得分:-1)
您可以使用@Resource注释而不是@Autowire。
尝试这是否有效。