使用cglib的错误

最新推荐文章于 2024-05-27 20:03:27 发布
最新推荐文章于 2024-05-27 20:03:27 发布
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今天用cglib实现一个简单 程序，代码如下。但是竟然产生StackOverflowError错误：

     package org.yu.useCGLIB.simple;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import net.sf.cglib.proxy.Enhancer;
public class AroundAvice implements MethodInterceptor {
 private static AroundAvice aroundAvice=new AroundAvice();
 private AroundAvice(){
  
 }
 public static Object newInstance(Class clazz){
  Enhancer enhancer=new Enhancer();
  enhancer.setSuperclass(clazz);
  enhancer.setCallback(aroundAvice);
  
  return enhancer.create();
 }

 public Object intercept(Object arg0, Method arg1, Object[] arg2,
   MethodProxy arg3) throws Throwable {
  
  System.out.println(arg0);
  System.out.println(arg1);
  System.out.println(arg3);
  System.out.println(arg2);
 
  return null;
 }
 public static void main(String args[]){
  MethodInterface me=(MethodInterface)newInstance(MethodInterfaceImp.class);
  me.say();
 }

}

出现以下错误：

      Exception in thread "main" java.lang.StackOverflowError
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)
 at org.yu.useCGLIB.simple.AroundAvice.intercept(AroundAvice.java:24)
 at org.yu.useCGLIB.simple.MethodInterfaceImp$$EnhancerByCGLIB$$ee4216f6.toString(<generated>)
 at java.lang.String.valueOf(Unknown Source)
 at java.io.PrintStream.print(Unknown Source)
 at java.io.PrintStream.println(Unknown Source)

 

按照cglib的官方网站的trace写法，能解决如下错误，但还不知原因：

代码如下：

package org.yu.useCGLIB.simple;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import net.sf.cglib.proxy.Enhancer;
public class AroundAvice implements MethodInterceptor {
 private static AroundAvice aroundAvice=new AroundAvice();
 private AroundAvice(){
  
 }
 public static Object newInstance(Class clazz){
  Enhancer enhancer=new Enhancer();
  enhancer.setSuperclass(clazz);
  enhancer.setCallback(aroundAvice);
  
  return enhancer.create();
 }

 public Object intercept(Object arg0, Method arg1, Object[] arg2,
   MethodProxy arg3) throws Throwable {
  
  
  // TODO Auto-generated method stub
  for(int i=0;i<arg2.length;i++){
  if( arg0 == arg2[i])
            System.out.println("this");
        else
           System.out.println(arg2[i]);
  }
  System.out.println(arg1);
  Object retValFromSuper = null;
  retValFromSuper=arg3.invokeSuper(arg0,arg2);
  if( arg0 == retValFromSuper)
           System.out.println("this");
        else System.out.println(retValFromSuper);
     //System.out.println("调用 "+arg1.getName()+" 方法前");
  //Object retValFromSuper=arg3.invokeSuper(arg0,arg2);
  //System.out.println("调用 "+arg1.getName()+" 方法后");
  return null;//retValFromSuper;
 }
 public static void main(String args[]){
  MethodInterface me=(MethodInterface)newInstance(MethodInterfaceImp.class);
  me.say();
 }

}

有如下输出结果：

public void org.yu.useCGLIB.simple.MethodInterfaceImp.say()
Hello world
null

显然问题解决了但还是找不到原因：

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