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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly

There is a newer version: 5.2.0



package samples;

import java.beans.*;
import java.lang.reflect.*;
import org.easymock.cglib.proxy.*;

/**
 *
 * @author  baliuka
 */
public class Beans implements MethodInterceptor {
    
    private PropertyChangeSupport propertySupport;
   
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        
        propertySupport.addPropertyChangeListener(listener);
        
    }
    
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertySupport.removePropertyChangeListener(listener);
    }
    
    public static  Object newInstance( Class clazz ){
        try{
            Beans interceptor = new Beans();
            Enhancer e = new Enhancer();
            e.setSuperclass(clazz);
            e.setCallback(interceptor);
            Object bean = e.create();
            interceptor.propertySupport = new PropertyChangeSupport( bean );
            return bean;
        }catch( Throwable e ){
            e.printStackTrace();
            throw new Error(e.getMessage());
        }
        
    }
    
    static final Class C[] = new Class[0];
    static final Object emptyArgs [] = new Object[0];


    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        Object retValFromSuper = null;
        try {
            if (!Modifier.isAbstract(method.getModifiers())) {
                retValFromSuper = proxy.invokeSuper(obj, args);
            }
        } finally {
            String name = method.getName();
            if( name.equals("addPropertyChangeListener")) {
                addPropertyChangeListener((PropertyChangeListener)args[0]);
            }else if ( name.equals( "removePropertyChangeListener" ) ){
                removePropertyChangeListener((PropertyChangeListener)args[0]);
            }
            if( name.startsWith("set") &&
                args.length == 1 &&
                method.getReturnType() == Void.TYPE ){
            
                char propName[] = name.substring("set".length()).toCharArray();
            
                propName[0] = Character.toLowerCase( propName[0] );
                propertySupport.firePropertyChange( new String( propName ) , null , args[0]);
            
            }
        }
        return retValFromSuper;
    }
    
    public static void main( String args[] ){
        
        Bean  bean =  (Bean)newInstance( Bean.class );
        
        bean.addPropertyChangeListener(
        new PropertyChangeListener(){
            public void propertyChange(PropertyChangeEvent evt){
                System.out.println(evt);
            }
        }
        );
        
        bean.setSampleProperty("TEST");
        
        
    }
    
    
}