org.springframework.boot.loader.MainMethodRunner Maven / Gradle / Ivy
/*
* 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.
*/
package org.springframework.boot.loader;
import java.lang.reflect.Method;
/**
* Utility class that used by {@link 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);
}
}
}