Spring AOP,声明父母抛出异常 [英] Spring AOP, declare-parents cast exception
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问题描述
我有:
- 一个接口GenericDao
- 一个 类 GenericDaoImpl 实现了 GenericDao
- 一个类 UserDao
UserDao userDao;
public void setUserDao(UserDao val) { userDao = val; }
...
((GenericDao) userDao).update(user);
<小时>
我的 Beans.xml 看起来像:
My Beans.xml looks like:
<bean id="genericUserDao" class="dao.GenericDaoImpl">
...
<property name="sessionFactory" ref="hibernateSessionFactory" />
</bean>
<bean id="userDao" class="dao.user.UserDao">
<property name="sessionFactory" ref="hibernateSessionFactory" />
</bean>
<aop:config>
<aop:aspect>
<aop:declare-parents
types-matching="dao.user.UserDao"
implement-interface="dao.GenericDao"
default-impl="genericUserDao" />
</aop:aspect>
</aop:config>
这是造成的
java.lang.ClassCastException: dao.user.UserDao 不能转换为 dao.GenericDao
我也尝试将 default-impl 设置为:dao.user.UserDao 但结果是一样的.
I also tried setting default-impl to: dao.user.UserDao but result is the same.
我找不到任何显示正确 xml 配置的好的文档或示例.
I couldn't find any good documentation or examples showing proper xml configuration.
我的 XML 有什么问题?
What is wrong with my XML?
这是完整的错误堆栈:
Exception in thread "Thread-3" java.lang.ClassCastException: dao.user.UserDao cannot be cast to dao.GenericDao
at dao.GenericDao$$FastClassBySpringCGLIB$$d43da5ef.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
at dao.user.UserDao$$EnhancerBySpringCGLIB$$957148da.update(<generated>)
推荐答案
我找到了解决方案.
<aop:config>
<aop:aspect>
<aop:declare-parents
types-matching="dao.user.UserDao+"
implement-interface="dao.GenericDao"
delegate-ref="genericUserDao" />
</aop:aspect>
</aop:config>
需要在类型匹配中添加加号 (+) 并将 default-impl 更改为 delegate-ref.
Needed to add plus sign (+) to types-matching and change default-impl to delegate-ref.
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