84 lines
3.5 KiB
Java
84 lines
3.5 KiB
Java
/*
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* Copyright (c) 2020, 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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* @summary Test issues with instantiating hidden classes.
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* @library /test/lib
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* @modules jdk.compiler
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* @run main InstantiateHiddenClass
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*/
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import java.lang.invoke.MethodType;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.invoke.MethodHandles.Lookup.ClassOption;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
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import jdk.test.lib.compiler.InMemoryJavaCompiler;
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public class InstantiateHiddenClass {
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static byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass",
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"public class TestClass { " +
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" public static void concat(String one, String two) throws Throwable { " +
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" System.out.println(one + two);" +
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" } } ");
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public static void main(String[] args) throws Throwable {
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// This class is also used by the appcds/dynamicArchive/RegularHiddenClass.java
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// test which will pass the "keep-alive" argument during dynamic CDS dump
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// for preventing from being GC'ed prior to the dumping operation.
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boolean keepAlive = false;
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if (args.length == 1 && args[0].equals("keep-alive")) {
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keepAlive = true;
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}
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// Test that a hidden class cannot be found through its name.
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try {
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Lookup lookup = MethodHandles.lookup();
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Class<?> c0 = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass();
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Class.forName(c0.getName()).newInstance();
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throw new RuntimeException("Expected ClassNotFoundException not thrown");
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} catch (ClassNotFoundException e ) {
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// Test passed
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}
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// Create two hidden classes and instantiate an object from each of them.
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// Verify that the references to these objects are different and references
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// to their classes are not equal either.
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Lookup lookup = MethodHandles.lookup();
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ClassOption classOption = keepAlive ? STRONG : NESTMATE;
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Class<?> c1 = lookup.defineHiddenClass(klassbuf, false, classOption).lookupClass();
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Class<?> c2 = lookup.defineHiddenClass(klassbuf, false, classOption).lookupClass();
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Object o1 = c1.newInstance();
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Object o2 = c2.newInstance();
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if (o1 == o2) {
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throw new RuntimeException("Objects should not be equal");
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}
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if (o1.getClass() == o2.getClass()) {
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throw new RuntimeException("Classes should not be equal");
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}
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}
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}
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