Mercurial > jdk8-mips64-public > hotspot / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/test/runtime/ClassUnload/KeepAliveClassLoader.java	Wed Apr 27 01:25:04 2016 +0800
     1.3 @@ -0,0 +1,78 @@
     1.4 +/*
     1.5 + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
     1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.7 + *
     1.8 + * This code is free software; you can redistribute it and/or modify it
     1.9 + * under the terms of the GNU General Public License version 2 only, as
    1.10 + * published by the Free Software Foundation.
    1.11 + *
    1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
    1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.14 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.15 + * version 2 for more details (a copy is included in the LICENSE file that
    1.16 + * accompanied this code).
    1.17 + *
    1.18 + * You should have received a copy of the GNU General Public License version
    1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
    1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.21 + *
    1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    1.23 + * or visit www.oracle.com if you need additional information or have any
    1.24 + * questions.
    1.25 + */
    1.26 +
    1.27 +/*
    1.28 + * @test KeepAliveClassLoader
    1.29 + * @summary This test case uses a java.lang.ClassLoader instance to keep a class alive.
    1.30 + * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
    1.31 + * @library classes
    1.32 + * @build KeepAliveClassLoader test.Empty
    1.33 + * @build ClassUnloadCommon
    1.34 + * @run main ClassFileInstaller sun.hotspot.WhiteBox
    1.35 + * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClassLoader
    1.36 + */
    1.37 +
    1.38 +import sun.hotspot.WhiteBox;
    1.39 +
    1.40 +/**
    1.41 + * Test that verifies that classes are not unloaded when specific types of references are kept to them.
    1.42 + */
    1.43 +public class KeepAliveClassLoader {
    1.44 +  private static final String className = "test.Empty";
    1.45 +  private static final WhiteBox wb = WhiteBox.getWhiteBox();
    1.46 +  public static Object escape = null;
    1.47 +
    1.48 +
    1.49 +  public static void main(String... args) throws Exception {
    1.50 +    ClassLoader cl = ClassUnloadCommon.newClassLoader();
    1.51 +    Class<?> c = cl.loadClass(className);
    1.52 +    Object o = c.newInstance();
    1.53 +    o = null; c = null;
    1.54 +    escape = cl;
    1.55 +
    1.56 +    {
    1.57 +        boolean isAlive = wb.isClassAlive(className);
    1.58 +        System.out.println("testClassLoader (1) alive: " + isAlive);
    1.59 +
    1.60 +        ClassUnloadCommon.failIf(!isAlive, "should be alive");
    1.61 +    }
    1.62 +    ClassUnloadCommon.triggerUnloading();
    1.63 +
    1.64 +    {
    1.65 +        boolean isAlive = wb.isClassAlive(className);
    1.66 +        System.out.println("testClassLoader (2) alive: " + isAlive);
    1.67 +
    1.68 +        ClassUnloadCommon.failIf(!isAlive, "should be alive");
    1.69 +    }
    1.70 +    cl = null;
    1.71 +    escape = null;
    1.72 +    ClassUnloadCommon.triggerUnloading();
    1.73 +
    1.74 +    {
    1.75 +        boolean isAlive = wb.isClassAlive(className);
    1.76 +        System.out.println("testClassLoader (3) alive: " + isAlive);
    1.77 +        ClassUnloadCommon.failIf(isAlive, "should be unloaded");
    1.78 +    }
    1.79 +
    1.80 +  }
    1.81 +}