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WildFly Swarm: Bootstrap
There is a newer version: 2018.5.0
/**
 * Copyright 2015-2016 Red Hat, Inc, and individual contributors.
 *
 * 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.wildfly.swarm.bootstrap;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URISyntaxException;

import org.jboss.modules.Module;
import org.jboss.modules.ModuleIdentifier;
import org.jboss.modules.ModuleLoadException;
import org.wildfly.swarm.bootstrap.modules.BootModuleLoader;
import org.wildfly.swarm.bootstrap.util.Layout;
import org.wildfly.swarm.bootstrap.util.UberJarManifest;

/**
 * @author Bob McWhirter
 */
public class Main {

    public static final String DEFAULT_MAIN_CLASS_NAME = "org.wildfly.swarm.Swarm";

    public Main(String... args) throws Throwable {
        this.args = args;
    }

    public static void main(String... args) throws Throwable {
        //TODO Move property key to -spi
        System.setProperty("swarm.isuberjar", Boolean.TRUE.toString());
        new Main(args).run();
    }

    public void run() throws Throwable {
        setupBootModuleLoader();
        invoke(getMainClass());
    }

    public void setupBootModuleLoader() {
        System.setProperty("boot.module.loader", BootModuleLoader.class.getName());
    }

    public String getMainClassName() throws IOException, URISyntaxException {
        String mainClassName = null;
        UberJarManifest manifest = new UberJarManifest(Layout.getInstance().getManifest());

        mainClassName = manifest.getMainClassName();

        if (mainClassName == null) {
            mainClassName = DEFAULT_MAIN_CLASS_NAME;
        }

        return mainClassName;
    }

    public Class getMainClass() throws IOException, URISyntaxException, ModuleLoadException, ClassNotFoundException {
        String mainClassName = getMainClassName();

        Module module = Module.getBootModuleLoader().loadModule(ModuleIdentifier.create("swarm.application"));

        return module.getClassLoader().loadClass(mainClassName);
    }

    public void invoke(Class mainClass) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        final Method mainMethod = mainClass.getMethod("main", String[].class);

        final int modifiers = mainMethod.getModifiers();
        if (!Modifier.isStatic(modifiers)) {
            throw new NoSuchMethodException("Main method is not static for " + mainClass);
        }

        mainMethod.invoke(null, new Object[]{this.args});
    }

    private final String[] args;


}