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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

class, class, method, method, object, object, reflection, reflectionmethodinvoker, reflectionmethodinvoker, string, throwable

The Groovy source code

 * Copyright 2003-2007 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.runtime;

import java.lang.reflect.Method;

 * Utility class to call methods through reflection, and falls through using the <code>Invoker to call the method if it fails.
 * The class is particularly useful for Groovy classes implementing <code>GroovyInterceptable,
 * since it is not possible to call any method from this class,
 * because it is intercepted by the <code>invokeMethod() method.
 * @author Guillaume Laforge
public class ReflectionMethodInvoker {

     * Invoke a method through reflection.
     * Falls through to using the Invoker to call the method in case the reflection call fails..
     * @param object the object on which to invoke a method
     * @param methodName the name of the method to invoke
     * @param parameters the parameters of the method call
     * @return the result of the method call
    public static Object invoke(Object object, String methodName, Object[] parameters) {
        try {
            Class[] classTypes = new Class[parameters.length];
            for (int i = 0; i < classTypes.length; i++) {
                classTypes[i] = parameters[i].getClass();
            Method method = object.getClass().getMethod(methodName, classTypes);
            return method.invoke(object, parameters);
        } catch (Throwable t) {
            return InvokerHelper.invokeMethod(object, methodName,  parameters);


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