001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.loader; 018 019import java.lang.reflect.Method; 020 021/** 022 * Utility class that is used by {@link Launcher}s to call a main method. The class 023 * containing the main method is loaded using the thread context class loader. 024 * 025 * @author Phillip Webb 026 * @author Andy Wilkinson 027 */ 028public class MainMethodRunner { 029 030 private final String mainClassName; 031 032 private final String[] args; 033 034 /** 035 * Create a new {@link MainMethodRunner} instance. 036 * @param mainClass the main class 037 * @param args incoming arguments 038 */ 039 public MainMethodRunner(String mainClass, String[] args) { 040 this.mainClassName = mainClass; 041 this.args = (args != null) ? args.clone() : null; 042 } 043 044 public void run() throws Exception { 045 Class<?> mainClass = Thread.currentThread().getContextClassLoader() 046 .loadClass(this.mainClassName); 047 Method mainMethod = mainClass.getDeclaredMethod("main", String[].class); 048 mainMethod.invoke(null, new Object[] { this.args }); 049 } 050 051}