| /* |
| * Copyright (c) 2004, 2008, 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 4989690 6259855 6706299 |
| * @summary Check that version-related system property invariants hold. |
| * @author Martin Buchholz |
| */ |
| |
| import java.io.*; |
| import java.net.URLClassLoader; |
| import java.net.URL; |
| |
| public class Versions { |
| static String getProperty(String prop) throws Exception { |
| String value = System.getProperty(prop); |
| if (value == null) |
| throw new Exception("No such system property: " + prop); |
| System.out.printf("%s=%s%n", prop, value); |
| return value; |
| } |
| |
| static ClassLoader cl; |
| |
| static void checkClassVersion(int major, int minor, boolean expectSupported) |
| throws Exception |
| { |
| final String className = "ClassVersionTest"; |
| final String classFile = className + ".class"; |
| |
| // We create an invalid class file, (only magic and version info), |
| // but the version info must be checked before the body. |
| final DataOutputStream dos = |
| new DataOutputStream(new FileOutputStream(classFile)); |
| dos.writeLong((0xCafeBabel << 32) + (minor << 16) + major); |
| dos.close(); |
| |
| boolean supported = true; |
| try { |
| Class.forName(className, false, cl); |
| } catch (UnsupportedClassVersionError e) { |
| supported = false; |
| } catch (Throwable t) { |
| // We expect an Exception indicating invalid class file |
| } |
| new File(classFile).delete(); |
| if (supported != expectSupported) |
| throw new Exception("Forgot to update java.class.version?"); |
| } |
| |
| public static void main(String [] args) throws Exception { |
| String classVersion = getProperty("java.class.version"); |
| String javaVersion = getProperty("java.version"); |
| String VMVersion = getProperty("java.vm.version"); |
| String runtimeVersion = getProperty("java.runtime.version"); |
| String specVersion = getProperty("java.specification.version"); |
| |
| if (! (javaVersion.startsWith(specVersion) && |
| runtimeVersion.startsWith(specVersion))) |
| throw new Exception("Invalid version-related system properties"); |
| |
| //---------------------------------------------------------------- |
| // Check that java.class.version is correct. |
| // Injecting a larger major or minor version number into a |
| // .class file should result in UnsupportedClassVersionError. |
| //---------------------------------------------------------------- |
| String[] versions = classVersion.split("\\."); |
| int majorVersion = Integer.parseInt(versions[0]); |
| int minorVersion = Integer.parseInt(versions[1]); |
| System.out.printf("majorVersion=%s%n",majorVersion); |
| System.out.printf("minorVersion=%s%n",minorVersion); |
| |
| // Look in ".", and *not* in CLASSPATH |
| cl = new URLClassLoader(new URL[]{new File("./").toURL()}, null); |
| |
| checkClassVersion(majorVersion , minorVersion , true ); |
| checkClassVersion(majorVersion + 1, minorVersion , false); |
| checkClassVersion(majorVersion , minorVersion + 1, false); |
| } |
| } |