org.apache.oozie.action.hadoop.JavaMain.java Source code

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Here is the source code for org.apache.oozie.action.hadoop.JavaMain.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.oozie.action.hadoop;

import org.apache.hadoop.conf.Configuration;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class JavaMain extends LauncherMain {
    public static final String JAVA_MAIN_CLASS = "oozie.action.java.main";

    /**
     * @param args Invoked from LauncherMapper:map()
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        run(JavaMain.class, args);
    }

    @Override
    protected void run(String[] args) throws Exception {

        Configuration actionConf = loadActionConf();

        setYarnTag(actionConf);

        LauncherMainHadoopUtils.killChildYarnJobs(actionConf);

        Class<?> klass = actionConf.getClass(JAVA_MAIN_CLASS, Object.class);
        System.out.println("Main class        : " + klass.getName());
        System.out.println("Arguments         :");
        for (String arg : args) {
            System.out.println("                    " + arg);
        }
        System.out.println();
        Method mainMethod = klass.getMethod("main", String[].class);
        try {
            mainMethod.invoke(null, (Object) args);
        } catch (InvocationTargetException ex) {
            // Get rid of the InvocationTargetException and wrap the Throwable
            throw new JavaMainException(ex.getCause());
        }
    }

}