hotspot/test/runtime/ClassUnload/KeepAliveClass.java
author lana
Sun, 28 Jun 2015 16:39:04 -0700
changeset 31240 9419a7f16a5c
parent 28190 5a6b07edeb21
child 33730 30e064828045
permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2013, 2014, 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 KeepAliveClass
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 * @summary This test case uses a java.lang.Class instance to keep a class alive.
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 * @library /testlibrary /../../test/lib /runtime/testlibrary
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 * @library classes
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 * @build KeepAliveClass test.Empty
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 * @build ClassUnloadCommon
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 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
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 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClass
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 */
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import java.lang.ref.SoftReference;
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import sun.hotspot.WhiteBox;
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/**
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 * Test that verifies that classes are not unloaded when specific types of references are kept to them.
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 */
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public class KeepAliveClass {
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  private static final String className = "test.Empty";
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  private static final WhiteBox wb = WhiteBox.getWhiteBox();
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  public static Object escape = null;
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  public static void main(String... args) throws Exception {
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    ClassLoader cl = ClassUnloadCommon.newClassLoader();
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    Class<?> c = cl.loadClass(className);
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    Object o = c.newInstance();
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    o = null; cl = null;
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    escape = c;
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    {
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        boolean isAlive = wb.isClassAlive(className);
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        System.out.println("testClass (1) alive: " + isAlive);
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        ClassUnloadCommon.failIf(!isAlive, "should be alive");
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    }
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    ClassUnloadCommon.triggerUnloading();
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    {
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        boolean isAlive = wb.isClassAlive(className);
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        System.out.println("testClass (2) alive: " + isAlive);
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        ClassUnloadCommon.failIf(!isAlive, "should be alive");
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    }
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    c = null;
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    escape = null;
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    ClassUnloadCommon.triggerUnloading();
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    {
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        boolean isAlive = wb.isClassAlive(className);
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        System.out.println("testClass (3) alive: " + isAlive);
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        ClassUnloadCommon.failIf(isAlive, "should be unloaded");
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    }
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  }
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}