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Java example source code file (T6893943.java)

This example Java source code file (T6893943.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, bufferedreader, exception, file, j\-xbootclasspath, newline, no_args, printwriter, processbuilder, string, stringwriter, t6893943, unexpected, util

The T6893943.java Java example source code

/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 * 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 6893943 6937318
 * @summary exit code from javah with no args is 0
 */

import java.io.*;
import java.util.*;

public class T6893943 {
    static final String[] NO_ARGS = { };
    static final String[] HELP = { "-help" };
    static final String NEWLINE = System.getProperty("line.separator");

    public static void main(String... args) throws Exception {
        new T6893943().run();
    }

    void run() throws Exception {
        testSimpleAPI(NO_ARGS, 1);
        testSimpleAPI(HELP, 0);
        testCommand(NO_ARGS, 1);
        testCommand(HELP, 0);
    }

    void testSimpleAPI(String[] args, int expect_rc) throws Exception {
        System.err.println("Test simple api: " + Arrays.asList(args));
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        int rc = com.sun.tools.javah.Main.run(args, pw);
        pw.close();
        expect("testSimpleAPI", sw.toString(), rc, expect_rc);
    }

    void testCommand(String[] args, int expect_rc) throws Exception {
        System.err.println("Test command: " + Arrays.asList(args));
        File javaHome = new File(System.getProperty("java.home"));
        if (javaHome.getName().equals("jre"))
            javaHome = javaHome.getParentFile();

        List<String> command = new ArrayList();
        command.add(new File(new File(javaHome, "bin"), "javah").getPath());
        command.add("-J-Xbootclasspath:" + System.getProperty("sun.boot.class.path"));
        command.addAll(Arrays.asList(args));
        //System.err.println("command: " + command);

        ProcessBuilder pb = new ProcessBuilder(command);
        pb.redirectErrorStream(true);
        Process p = pb.start();
        p.getOutputStream().close();
        StringWriter sw = new StringWriter();
        String line;
        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
        while ((line = in.readLine()) != null)
            sw.write(line + NEWLINE);
        int rc = p.waitFor();
        expect("testCommand", sw.toString(), rc, expect_rc);
    }

    void expect(String name, String out, int actual_rc, int expect_rc) throws Exception {
        if (out.isEmpty())
            throw new Exception("No output from javah");

        if (!out.startsWith("Usage:")) {
            System.err.println(out);
            throw new Exception("Unexpected output from javah");
        }

        if (actual_rc != expect_rc)
            throw new Exception(name + ": unexpected exit: " + actual_rc + ", expected: " + expect_rc);
    }
}

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