Java tutorial
/* * Copyright 2012-2013 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.lang.reflect.Method; /** * Utility class that used by {@link org.springframework.boot.loader.Launcher}s to call a main method. This class allows * methods to be executed within a thread configured with a specific context class loader. * * @author Phillip Webb */ public class MainMethodRunner implements Runnable { private final String mainClassName; private final String[] args; /** * Create a new {@link MainMethodRunner} instance. * @param mainClass the main class * @param args incoming arguments */ public MainMethodRunner(String mainClass, String[] args) { this.mainClassName = mainClass; this.args = (args == null ? null : args.clone()); } @Override public void run() { try { Class<?> mainClass = Thread.currentThread().getContextClassLoader().loadClass(this.mainClassName); Method mainMethod = mainClass.getDeclaredMethod("main", String[].class); if (mainMethod == null) { throw new IllegalStateException(this.mainClassName + " does not have a main method"); } mainMethod.invoke(null, new Object[] { this.args }); } catch (Exception ex) { ex.printStackTrace(); System.exit(1); } } }