已导入jar包，asm-3.3.1,cglib-2.2，但不知为什么还是报错。

Exception in thread "main" java.lang.NoClassDefFoundError: org/objectweb/asm/Type

at net.sf.cglib.core.TypeUtils.parseType(TypeUtils.java:180)
at net.sf.cglib.core.KeyFactory.<clinit>(KeyFactory.java:66)
at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:69)
at javacore.proxy.cglib.CglibProxyExample.getProxy(CglibProxyExample.java:20)
at javacore.proxy.cglib.CglibProxyExample.testCGLBProxy(CglibProxyExample.java:39)
at javacore.proxy.cglib.CglibProxyExample.main(CglibProxyExample.java:44)

Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.Type

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 6 more

package javacore.proxy.cglib;

import javacore.reflection.ReflectServiceImpl;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;


----------
源代码如下

import java.lang.reflect.Method;

public class CglibProxyExample implements MethodInterceptor {
    /**
     * 生成cglib代理对象
     *
     * @param cls
     * @return Class类的cglib代理对象
     */
    public Object getProxy(Class cls) {
        //cglib的enhancer增强类对象
        Enhancer enhancer = new Enhancer();
        //设置增强类型
        enhancer.setSuperclass(cls);
        //定义代理逻辑对象为当前对象，要求当前对象实现MethodInterceptor方法
        enhancer.setCallback(this);
        return enhancer.create();
    }

    @Override
    public Object intercept(Object proxy, Method method, Object[] args,
                            MethodProxy methodProxy) throws Throwable {
        System.err.println("调用真实对象前");
        Object result = methodProxy.invokeSuper(proxy, args);
        System.err.println("调用真实对象后");
        return result;
    }

    public void testCGLBProxy() {
        CglibProxyExample cpe = new CglibProxyExample();
        ReflectServiceImpl obj = (ReflectServiceImpl) cpe.getProxy(ReflectServiceImpl.class);
        obj.sayHello("oaoa");
    }

    public static void main(String[] args) {
        new CglibProxyExample().testCGLBProxy();
    }
}