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comparison test/runtime/ClassUnload/KeepAliveObject.java @ 10230:33bcd9ead1d5

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8009577: Test test/closed/runtime/classunload broken Summary: Fixed tests to use new way of utilizing the WB API, fixed issue with where custom classloader got the classes from Reviewed-by: collins, mgerdin, zgu
author ctornqvi
date Tue, 07 May 2013 21:36:59 +0200
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10229:f6a055fcf47d 10230:33bcd9ead1d5
1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test KeepAliveObject
26 * @summary This test case uses a class instance to keep the class alive.
27 * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
28 * @library classes
29 * @build KeepAliveObject test.Empty
30 * @build ClassUnloadCommon
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveObject
33 */
34
35 import sun.hotspot.WhiteBox;
36
37 /**
38 * Test that verifies that classes are not unloaded when specific types of references are kept to them.
39 */
40 public class KeepAliveObject {
41 private static final String className = "test.Empty";
42 private static final WhiteBox wb = WhiteBox.getWhiteBox();
43 public static Object escape = null;
44
45 public static void main(String... args) throws Exception {
46 ClassLoader cl = ClassUnloadCommon.newClassLoader();
47 Class<?> c = cl.loadClass(className);
48 Object o = c.newInstance();
49 cl = null; c = null;
50 escape = o;
51
52 {
53 boolean isAlive = wb.isClassAlive(className);
54 System.out.println("testObject (1) alive: " + isAlive);
55
56 ClassUnloadCommon.failIf(!isAlive, "should be alive");
57 }
58
59 ClassUnloadCommon.triggerUnloading();
60
61 {
62 boolean isAlive = wb.isClassAlive(className);
63 System.out.println("testObject (2) alive: " + isAlive);
64
65 ClassUnloadCommon.failIf(!isAlive, "should be alive");
66 }
67 o = null;
68 escape = null;
69 ClassUnloadCommon.triggerUnloading();
70
71 {
72 boolean isAlive = wb.isClassAlive(className);
73 System.out.println("testObject (3) alive: " + isAlive);
74 ClassUnloadCommon.failIf(isAlive, "should be unloaded");
75 }
76
77 }
78 }