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Windup Frames is an extension of the upstream Frames project, with tools to ease debugging and integration within windup.

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package com.tinkerpop.frames.modules.javahandler;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 
 * Use a Java class to handle frame method calls. Unless overridden using the
 * {@link JavaHandlerClass} annotation the default handler will be a nested
 * class inside your frame interface called Impl. For example:
 * 
 *  * 
 * interface Person {
 * 
 *   @JavaHandler
 *   public String doSomething(); 
 * 
 *   abstract class Impl implements Person, JavaHandlerContext {
 *     public String doSomething() {
 *       return "Use Frames!";
 *     }
 *   }
 * }
 * 
 * 
 * @author Bryn Cooke
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface JavaHandler {

}