java/java-runtime/src/com/intellij/rt/ant/execution/AntMain2.java

/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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 com.intellij.rt.ant.execution;

import java.lang.reflect.InvocationTargetException;

public final class AntMain2 {

  public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    IdeaAntLogger2.guardStreams();
    
    // as we build classpath ourselves, and ensure all libraries are added to classpath, 
    // preferred way for us to run ant will be using the traditional ant entry point, via the "Main" class 
    try {
      final Class antMain = Class.forName("org.apache.tools.ant.Main");
      //noinspection HardCodedStringLiteral
      antMain.getMethod("main", new Class[]{args.getClass()}).invoke(null, new Object[]{args});
      return;
    }
    catch (ClassNotFoundException e) {
      // ignore
    }
    
    // fallback: try the newer approach, launcher
    // This approach is less preferred in our case, but still...
    // From the ant documentation: "You should start the launcher with the most minimal classpath possible, generally just the ant-launcher.jar."
    final Class antLauncher = Class.forName("org.apache.tools.ant.launch.Launcher");
    //noinspection HardCodedStringLiteral
    antLauncher.getMethod("main", new Class[]{args.getClass()}).invoke(null, new Object[]{args});

  }
}