83 lines
3.5 KiB
Java
83 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 the ability to safely unload a class that has an error
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* with its designated nest host. The nest host class must resolve
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* successfully but fail validation. This tests a specific, otherwise
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* untested, code path in ResolutionErrorTable::free_entry.
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*
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* @library /test/lib
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* @compile TestNestHostErrorWithClassUnload.java
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* Helper.java
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* PackagedNestHost.java
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* PackagedNestHost2.java
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* @compile PackagedNestHost2Member.jcod
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*
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* @run main/othervm -Xlog:class+unload=trace TestNestHostErrorWithClassUnload
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*/
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// Test setup:
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// PackagedNestHost.java defines P1.PackagedNestHost, which is referenced
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// by P2.PackageNestHost2.Member
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// PackagedNestHost2.java defines P2.PackagedNestHost2 and its nested Member
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// class.
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// PackagedNestHost2Member.jcod changes P2.PackagedNestHost.Member to claim
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// it is in the nest of P1.PackagedNestHost.
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// Helper.java is a helper class to run the test under the other classloader.
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// A separate class is used to avoid confusion because if a public nested
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// class were to be used, then the main test class would be loaded a second
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// time in the other loader, and also subsequently unloaded.
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//
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// We load all classes into a new classloader and then try to call
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// P2.PackagedNestHost.Member.m() which will be private at runtime. That will
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// trigger nest host resolution and validation and the invocation will fail
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// with IllegalAccessError. We then drop the classloader and invoke GC to force
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// the unloading of the classes. Not all GC configurations are guaranteed to
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// result in unloading, but that isn't essential for the test to succeed - we
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// know that when unloading does occur we have tested the desired code path.
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import jdk.test.lib.classloader.ClassUnloadCommon;
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public class TestNestHostErrorWithClassUnload {
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static final MethodType INVOKE_T = MethodType.methodType(void.class);
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public static void main(String[] args) throws Throwable {
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ClassLoader cl = ClassUnloadCommon.newClassLoader();
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Class<?> c = cl.loadClass("Helper");
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MethodHandle mh = MethodHandles.lookup().findStatic(c, "test", INVOKE_T);
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mh.invoke();
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// now drop all references so we can trigger unloading
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mh = null;
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c = null;
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cl = null;
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ClassUnloadCommon.triggerUnloading();
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}
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}
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