1 /*
   2  * Copyright (c) 2018, 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 8198908
  27  * @summary Check that preview minor version and --enable-preview are handled
  28  *          correctly.
  29  * @modules java.base/jdk.internal.misc
  30  * @library /test/lib
  31  * @run main PreviewVersion
  32  */
  33 
  34 import java.io.File;
  35 import jdk.test.lib.compiler.InMemoryJavaCompiler;
  36 import jdk.test.lib.ByteCodeLoader;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import jdk.test.lib.process.ProcessTools;
  39 
  40 public class PreviewVersion {
  41 
  42     public static void main(String args[]) throws Throwable {
  43         System.out.println("Regression test for bug 8198908");
  44 
  45         byte klassbuf[] = InMemoryJavaCompiler.compile("PVTest",
  46             "public class PVTest { " +
  47                 "public static void main(String argv[]) { " +
  48                     "System.out.println(\"Hi!\"); } }");
  49 
  50         // Set class's minor version to 65535.
  51         klassbuf[4] = -1;
  52         klassbuf[5] = -1;
  53 
  54         // Run the test. This should fail because --enable-preview is not specified.
  55         ClassFileInstaller.writeClassToDisk("PVTest", klassbuf, System.getProperty("test.classes"));
  56         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  57             "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
  58         OutputAnalyzer oa = new OutputAnalyzer(pb.start());
  59         oa.shouldContain("Preview features are not enabled");
  60         oa.shouldHaveExitValue(1);
  61 
  62         // This should be successful because --enable-preview is specified.
  63         pb = ProcessTools.createJavaProcessBuilder("--enable-preview",
  64             "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
  65         oa = new OutputAnalyzer(pb.start());
  66         oa.shouldContain("Hi!");
  67 
  68         // Test -Xlog:class+preview
  69         pb = ProcessTools.createJavaProcessBuilder("--enable-preview", "-Xlog:class+preview",
  70             "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
  71         oa = new OutputAnalyzer(pb.start());
  72         oa.shouldContain("[info][class,preview] Loading preview feature type PVTest");
  73 
  74         // Subtract 1 from class's major version.  The class should fail to load
  75         // because its major_version does not match the JVM current version.
  76         int prev_major_version = Runtime.version().feature() - 1;
  77         klassbuf[6] = (byte)((prev_major_version >> 8) & 0xff);
  78         klassbuf[7] = (byte)(prev_major_version & 0xff);
  79         try {
  80             ByteCodeLoader.load("PVTest", klassbuf);
  81             throw new RuntimeException("UnsupportedClassVersionError exception not thrown");
  82         } catch (java.lang.UnsupportedClassVersionError e) {
  83             if (!e.getMessage().contains("compiled with preview features that are unsupported")) {
  84                 throw new RuntimeException(
  85                     "Wrong UnsupportedClassVersionError exception: " + e.getMessage());
  86             }
  87         }
  88 
  89         // Set class's major version to 45.  The class should load because class
  90         // version 45.65535 is valid.
  91         klassbuf[6] = 0;
  92         klassbuf[7] = 45;
  93         try {
  94             ByteCodeLoader.load("PVTest", klassbuf);
  95         } catch (java.lang.UnsupportedClassVersionError e) {
  96             throw new RuntimeException(
  97                 "Unexpected UnsupportedClassVersionError exception thrown: " + e.getMessage());
  98         }
  99 
 100         // Check that a class with a recent older major version and a non-zero
 101         // minor version fails to load.
 102         klassbuf[6] = 0;
 103         klassbuf[7] = 53;
 104         klassbuf[4] = 0;
 105         klassbuf[5] = 2;
 106         try {
 107             ByteCodeLoader.load("PVTest", klassbuf);
 108             throw new RuntimeException("UnsupportedClassVersionError exception not thrown");
 109         } catch (java.lang.UnsupportedClassVersionError e) {
 110             if (!e.getMessage().contains("was compiled with an invalid non-zero minor version")) {
 111                 throw new RuntimeException(
 112                     "Wrong UnsupportedClassVersionError exception: " + e.getMessage());
 113             }
 114         }
 115     }
 116 }