1 /*

     2  * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 4876942 6715251

    27  * @summary javap invoked without args does not print help screen

    28  * @modules jdk.jdeps/com.sun.tools.javap

    29  */

    30 

    31 import java.io.*;

    32 import java.util.zip.*;

    33 

    34 public class T4876942 {

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

    36         new T4876942().run();

    37     }

    38 

    39     public void run() throws IOException {

    40         String output = javap();

    41         verify(output, "-public", "-protected", "-private"); // check that some of the options are listed

    42 

    43         if (errors > 0)

    44             throw new Error(errors + " found.");

    45     }

    46 

    47     String javap(String... args) {

    48         StringWriter sw = new StringWriter();

    49         PrintWriter out = new PrintWriter(sw);

    50         //sun.tools.javap.Main.entry(args);

    51         int rc = com.sun.tools.javap.Main.run(args, out);

    52         if (rc != (args.length == 0 ? 2 : 0))

    53             throw new Error("javap failed. rc=" + rc);

    54         out.close();

    55         return sw.toString();

    56     }

    57 

    58     void verify(String output, String... expects) {

    59         for (String expect: expects) {

    60             if (output.indexOf(expect)< 0)

    61                 error(expect + " not found");

    62         }

    63     }

    64 

    65     void error(String msg) {

    66         System.err.println(msg);

    67         errors++;

    68     }

    69 

    70     int errors;

    71 }