java.lang.ClassCastException: $Proxy7 cannot be cast to ****

 

bean层：

public class PersonServiceBean implements PersonService {}

springAOP 代理层：

public class AspectMethod {

 @Pointcut("execution (*省略.*(..))")

 private void anymethod(){}  

 @Before("anymethod()")  

public void beforCheck()  

{   System.out.println("前置通知");  }

}

java.lang.ClassCastException: $Proxy7 cannot be cast to *****
 at cn.itcast.test.SpringAOPTest.test(SpringAOPTest.java:16)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:601)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

病因：  对于Spring AOP 采用两种代理方法，一种是常规JDK，一种是CGLIB，当代理对象实现了至少一个接口时，默认使用JDK动态创建代理对象，当代理对象没有实现任何接口时，就会使用CGLIB方法。如果你的代理对象没有实现接口的方法，就将代理对象转换成接口。  获取代理类的代码该为： 

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); 

PersonService personService= (PersonService)ctx.getBean("personService");