JBoss Community

Greetings, I'm starting with Javassist, I have implemented an example of Hello World with following code:

public class HelloWorld {
 
 
   public static void main(String[] args) {
       new HelloWorld().sayHello();
   }
 
   public void sayHello(){
       System.out.println("Hello!!! This is the original version!!!");
   }
}

import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
 
import java.io.IOException;
 
import static javassist.ClassPool.getDefault;
 
 
public class ByteCodeInjector {
 
   public static final String CLASS_NAME = "HelloWorld";
   public static final String METHOD = "sayHello";
 
   public static void main(String[] argos) throws Exception{
       modifyByteCode(CLASS_NAME,METHOD);
   }
 
   public static void modifyByteCode(String className ,String methodName)
           throws NotFoundException, CannotCompileException, IOException {
       //Get the Class implementation byte code
       CtClass ctClass = getDefault().get(className);
 
       //Get the method from the Class byte code
       CtMethod method= ctClass.getDeclaredMethod(methodName);
 
       /** 
        * Creating the new Method implementation
        */
       StringBuffer content = new StringBuffer();
       content.append("{\n System.out.println(\"Hello!!! This is the Modified version!!!\");\n } ");
 
       /**
        * Inserting the content
        */
       method.setBody(content.toString());
       System.out.println("Replacing Method \' sayHello\' s body with new implementation : " + content);
        //modify the actual class File
       ctClass.writeFile();
   }
}

This example has already worked well compiling classes from console. My question is about what I need to implement this example in Eclipse? It must have some sort of special consideration?
Thank you for your help.