1 /*

     2  * Copyright (c) 1999, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 

    26 package java.lang;

    27 

    28 import java.io.PrintStream;

    29 

    30 class VersionProps {

    31 

    32 

    33     private static final String launcher_name =

    34         "@@LAUNCHER_NAME@@";

    35 

    36     private static final String java_version =

    37         "@@VERSION_SHORT@@";

    38 

    39     private static final String java_runtime_name =

    40         "@@RUNTIME_NAME@@";

    41 

    42     private static final String java_runtime_version =

    43         "@@VERSION_STRING@@";

    44 

    45     static {

    46         init();

    47     }

    48 

    49     public static void init() {

    50         System.setProperty("java.version", java_version);

    51         System.setProperty("java.runtime.version", java_runtime_version);

    52         System.setProperty("java.runtime.name", java_runtime_name);

    53     }

    54 

    55     /**

    56      * In case you were wondering this method is called by java -version.

    57      * Sad that it prints to stderr; would be nicer if default printed on

    58      * stdout.

    59      */

    60     public static void print() {

    61         print(System.err);

    62     }

    63 

    64     /**

    65      * This is the same as print except that it adds an extra line-feed

    66      * at the end, typically used by the -showversion in the launcher

    67      */

    68     public static void println() {

    69         print(System.err);

    70         System.err.println();

    71     }

    72 

    73     /**

    74      * Give a stream, it will print version info on it.

    75      */

    76     public static void print(PrintStream ps) {

    77         boolean isHeadless = false;

    78 

    79         /* Report that we're running headless if the property is true */

    80         String headless = System.getProperty("java.awt.headless");

    81         if ( (headless != null) && (headless.equalsIgnoreCase("true")) ) {

    82             isHeadless = true;

    83         }

    84 

    85         /* First line: platform version. */

    86         ps.println(launcher_name + " version \"" + java_version + "\"");

    87 

    88         /* Second line: runtime version (ie, libraries). */

    89 

    90         String jdk_debug_level = System.getProperty("jdk.debug", "release");

    91         /* Debug level is not printed for "release" builds */

    92         if ("release".equals(jdk_debug_level)) {

    93             jdk_debug_level = "";

    94         } else {

    95             jdk_debug_level = jdk_debug_level + " ";

    96         }

    97 

    98         ps.print(java_runtime_name + " (" + jdk_debug_level + "build " + java_runtime_version);

    99 

   100         if (java_runtime_name.indexOf("Embedded") != -1 && isHeadless) {

   101             // embedded builds report headless state

   102             ps.print(", headless");

   103         }

   104         ps.println(')');

   105 

   106         /* Third line: JVM information. */

   107         String java_vm_name    = System.getProperty("java.vm.name");

   108         String java_vm_version = System.getProperty("java.vm.version");

   109         String java_vm_info    = System.getProperty("java.vm.info");

   110         ps.println(java_vm_name + " (" + jdk_debug_level + "build " + java_vm_version + ", " +

   111                    java_vm_info + ")");

   112     }

   113 

   114 }