/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

   @bug  6526376

   @summary DeleteOnExitHook.add() produces NullPointerException

 */

import java.io.*;

/* NullPointerException in exec'ed process if fails.

 * This testcase is timing sensitive. It may sometimes pass even with this bug

 * present, but will never fail without it.

 */

public class DeleteOnExitNPE implements Runnable

{

    public static void main(String[] args) throws Exception {

        if (args.length == 0) {

            runTest();

        } else {

            doTest();

        }

    }

    public static void runTest() throws Exception {

        String cmd = System.getProperty("java.home") + File.separator +

                     "bin" + File.separator + "java" +

                     " -classpath " + System.getProperty("test.classes");

        Process process = Runtime.getRuntime().exec(cmd +  " DeleteOnExitNPE -test");

        BufferedReader isReader = new BufferedReader(new InputStreamReader(process.getInputStream()));

        BufferedReader esReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

        process.waitFor();

        boolean failed = false;

        String str;

        while ((str = isReader.readLine()) != null) {

            failed = true;

            System.out.println(str);

        }

        while ((str = esReader.readLine()) != null) {

            failed = true;

            System.err.println(str);

        }

        if (failed)

            throw new RuntimeException("Failed: No output should have been received from the process");

    }

    public static void doTest() {

        try {

            File file = File.createTempFile("DeleteOnExitNPE", null);

            file.deleteOnExit();

            Thread thread = new Thread(new DeleteOnExitNPE());

            thread.start();

            try {

                Thread.sleep(2000);

            } catch (InterruptedException ie) {

                ie.printStackTrace();

            }

            System.exit(0);

        } catch (IOException ioe) {

            ioe.printStackTrace();

        }

    }

    public void run() {

        File file = new File("xxyyzz");

        try {

            for (;;) {

                file.deleteOnExit();

            }

        } catch (IllegalStateException ise) {

            // ignore. This is ok.

            // Trying to add a file to the list of files marked as deleteOnExit when

            // shutdown is in progress and the DeleteOnExitHook is running.

        }

    }

}