spring2.5.6实现注解AOP出现奇怪错误
代码如下：
拦截类
- Java code
package com.spring.aop.service;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;@Aspectpublic class InterCeptor { @Pointcut("execution (public void com.spring.aop.service.impl.PersonServiceBeanImpl.*(..))") private void anyMethod(){}//声明一个切入点 @Before("anyMethod()")//放入切入点的名称带() public void doBeforCheck(){ System.out.println("我是前置通知！！"); } }业务接口：
- Java code
package com.spring.aop.service;public interface PersonServiceBean { public void save(String name); public void update(String name,Integer id); public String getPersonName(Integer id);}实现类：
- Java code
package com.spring.aop.service.impl;import com.spring.aop.service.PersonServiceBean;public class PersonServiceBeanImpl implements PersonServiceBean{ public void save(String name) { System.out.println("我是存入方法："+name); } public void update(String name, Integer id) { System.out.println("我是更新方法："+id); } public String getPersonName(Integer id) { return "测试："+id; }}配置文件：
- XML code
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <!-- <bean name="myTest" class="com.service.impl.PersonServiceImpl"> </bean> <bean id="myTest3" name="myTest4" class="com.service.impl.PersonServiceImpl"/> <bean id="myTest2" name="myTest" class="com.service.impl.PersonServiceImpl"/> <bean id="personServiceImpl" class="com.service.impl.PersonServiceImpl" lazy-init="false" scope="prototype"></bean> --> <aop:aspectj-autoproxy></aop:aspectj-autoproxy> <bean id="interCeptor" class="com.spring.aop.service.InterCeptor"></bean> <bean id="personServiceBeanImpl" class="com.spring.aop.service.impl.PersonServiceBeanImpl"></bean></beans>
测试类：
- Java code
package mytest;import java.lang.reflect.Method;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.spring.aop.service.PersonServiceBean;import com.spring.aop.service.impl.PersonServiceBeanImpl;//import com.service.impl.PersonServiceImpl;public class SpringTest { @Test public void myTest(){ ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[]{"bean.xml"});// PersonServiceImpl personServiceFactory = (PersonServiceImpl)ctx.getBean("personServiceImpl");// PersonServiceImpl personServiceFactory2 = (PersonServiceImpl)ctx.getBean("personServiceImpl");// if(personServiceFactory == personServiceFactory2){// System.out.println("====2=====");// }// Class<PersonServiceImpl> cPersonServiceImpl = PersonServiceImpl.class;// personServiceFactory.save(); PersonServiceBean personServiceBeanImpl = (PersonServiceBeanImpl)ctx.getBean("personServiceBeanImpl"); personServiceBeanImpl.save("test"); }}
现在出现这个问题，如果PersonServiceBeanImpl implements PersonServiceBean也就是继承这个接口，就会报：
java.lang.ClassCastException: $Proxy7
at mytest.SpringTest.myTest(SpringTest.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
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)
类型转换错误，这个事JDK1.5环境报的错，1.6和这个还不相同
下面是JDK1.6的异常
java.lang.ClassCastException: $Proxy7 cannot be cast to com.spring.aop.service.impl.PersonServiceBeanImpl
at mytest.SpringTest.myTest(SpringTest.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
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)
如果我去掉这个实现，就一切正常了。这个是什么原因呢？
记得CGlib这个包可以实现没有接口的AOP，难道是这个原因么？那么我把CGlib这个包去掉一样存在这个问题。。。
不太懂了。。。。。。
[解决办法]
PersonServiceBean personServiceBeanImpl = (PersonServiceBeanImpl)ctx.getBean("personServiceBeanImpl");
恩是的，这样要报错。
所以改为：
PersonServiceBean personServiceBeanImpl = (PersonServiceBean)ctx.getBean("personServiceBeanImpl");
personServiceBeanImpl.save("test");
[解决办法]
楼主不知道用你要管理的bean上面加上@Component，xml文件只需<context:annotation-config />
<context:component-scan base-package="com.bjsxt" />
总之统一比较好，不会出莫名其妙的错误