ProxyFactory Problem

[Javier Montagna]

Hi all, this is my first post since I am new at Spring and all, first of all I apologizes if this has being post already I try to look for it but didn't find the solution, however I found a similar problem in this post:

https://coderanch.com/t/453277/Spring/Application-Frameworks/Hello-World-with-AOP#2018936


Allow me to explain my situation, I am trying to implement a simple AOP aspect into my main Class, my program consist in two classes:
1)

package AOP_BeforeAdvice;

//@author Javier Adrian Montagna

import newpackage.MessageWriter;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.framework.ProxyFactory;

public class SimpleBeforeAdvice implements MethodBeforeAdvice{
    public static void main(String[] args) {

        MessageWriter target = new MessageWriter();  //Creo el target para insertar el Aspect
        ProxyFactory pf = new ProxyFactory();  // Creo el ProxyFactory

        pf.addAdvice(new SimpleBeforeAdvice());
        pf.setTarget(target);

        [color=red]MessageWriter proxy = (MessageWriter) pf.getProxy();[/color]
        proxy.writeMessage();

    }

    public void before(Method method, Object[] os, Object o) throws Throwable {
        System.out.println("Before Method: " + method.getName());
    }

    
} 

2)

 
package newpackage;

//@author Javier Adrian Montagna
public class MessageWriter {

    public void writeMessage() {
        System.out.print("World");
    }
}

When I try to run this program I get the following error:

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 org.springframework.aop.framework.Cglib2AopProxy.createEnhancer(Cglib2AopProxy.java:225)
        at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:152)
        at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:144)
        at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:97)
        at AOP_BeforeAdvice.SimpleBeforeAdvice.main(SimpleBeforeAdvice.java:19)
Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.Type
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        ... 8 more
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

I have mark in red the line that is causing problem in the compiler, when I look up the error It said that it was a CLASSPATH error but don't know how to fix it.

If anyone has a solution or comment please you are more than welcome, and if more information is needed please ask away

Thanks in advance

Eddie

[David Newton]

What libraries are you deploying? Looks like you're missing the ASM jar.

[Javier Montagna]

David Newton wrote:What libraries are you deploying? Looks like you're missing the ASM jar.

I am using spring-2.5.jar , but inside I do have the org.springframework.asm

I don't know if I answer your question haha, let me know if something is missing

PS: I am ussing NetBeans 6.8

Thanks for the reply

[David Newton]

Yes, you're missing the ASM library.

[Javier Montagna]

David Newton wrote:Yes, you're missing the ASM library.

Yes thank you very much!! It's working now jeje.

The solution is the following in case someone has the same problem:

1) Visit the following website: http://forge.ow2.org/project/download.php?group_id=23&file_id=12944 and download the file
2) Extract the zip file
3) Add the following library:
a) asm-all-3.2

Then run and it works.

Thanks again (I surely wish the book mention this ha-ha)

Have a great day

[David Newton]

All of the Spring dependencies are included in the Spring download that includes dependencies; it's important to use the correct version.

Glad you got it working!