1 /*
   2  * Copyright (c) 2008, 2015, 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
  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 }