106 lines
4.3 KiB
Java
106 lines
4.3 KiB
Java
/*
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* Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 4989690 6259855 6706299 8204565
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* @summary Check that version-related system property invariants hold.
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* @author Martin Buchholz
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*/
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import java.io.*;
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import java.net.URLClassLoader;
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import java.net.URL;
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public class Versions {
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static String getProperty(String prop) throws Exception {
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String value = System.getProperty(prop);
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if (value == null)
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throw new Exception("No such system property: " + prop);
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System.out.printf("%s=%s%n", prop, value);
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return value;
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}
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static ClassLoader cl;
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static void checkClassVersion(int major, int minor, boolean expectSupported)
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throws Exception
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{
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final String className = "ClassVersionTest";
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final String classFile = className + ".class";
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// We create an invalid class file, (only magic and version info),
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// but the version info must be checked before the body.
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final DataOutputStream dos =
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new DataOutputStream(new FileOutputStream(classFile));
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dos.writeLong((0xCafeBabel << 32) + (minor << 16) + major);
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dos.close();
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boolean supported = true;
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try {
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Class.forName(className, false, cl);
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} catch (UnsupportedClassVersionError e) {
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supported = false;
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} catch (Throwable t) {
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// We expect an Exception indicating invalid class file
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}
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new File(classFile).delete();
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if (supported != expectSupported)
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throw new Exception("Forgot to update java.class.version?");
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}
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public static void main(String [] args) throws Exception {
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String classVersion = getProperty("java.class.version");
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String javaVersion = getProperty("java.version");
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String runtimeVersion = getProperty("java.runtime.version");
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String specVersion = getProperty("java.specification.version");
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String vmSpecVersion = getProperty("java.vm.specification.version");
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String featureVersion = Integer.toString(Runtime.version().feature());
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if (! (javaVersion.startsWith(specVersion) &&
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runtimeVersion.startsWith(specVersion) &&
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specVersion.equals(featureVersion) &&
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vmSpecVersion.equals(featureVersion))) {
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throw new Exception("Invalid version-related system properties");
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}
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//----------------------------------------------------------------
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// Check that java.class.version is correct.
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// Injecting a larger major or minor version number into a
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// .class file should result in UnsupportedClassVersionError.
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//----------------------------------------------------------------
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String[] versions = classVersion.split("\\.");
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int majorVersion = Integer.parseInt(versions[0]);
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int minorVersion = Integer.parseInt(versions[1]);
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System.out.printf("majorVersion=%s%n",majorVersion);
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System.out.printf("minorVersion=%s%n",minorVersion);
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// Look in ".", and *not* in CLASSPATH
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cl = new URLClassLoader(new URL[]{new File("./").toURL()}, null);
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checkClassVersion(majorVersion , minorVersion , true );
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checkClassVersion(majorVersion + 1, minorVersion , false);
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checkClassVersion(majorVersion , minorVersion + 1, false);
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}
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}
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