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comparison test/runtime/ClassUnload/KeepAliveClass.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 KeepAliveClass
26 * @summary This test case uses a java.lang.Class instance to keep a class alive.
27 * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
28 * @library classes
29 * @build KeepAliveClass test.Empty
30 * @build ClassUnloadCommon
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClass
33 */
34
35 import java.lang.ref.SoftReference;
36 import sun.hotspot.WhiteBox;
37
38 /**
39 * Test that verifies that classes are not unloaded when specific types of references are kept to them.
40 */
41 public class KeepAliveClass {
42 private static final String className = "test.Empty";
43 private static final WhiteBox wb = WhiteBox.getWhiteBox();
44 public static Object escape = null;
45
46 public static void main(String... args) throws Exception {
47 ClassLoader cl = ClassUnloadCommon.newClassLoader();
48 Class<?> c = cl.loadClass(className);
49 Object o = c.newInstance();
50 o = null; cl = null;
51 escape = c;
52
53 {
54 boolean isAlive = wb.isClassAlive(className);
55 System.out.println("testClass (1) alive: " + isAlive);
56
57 ClassUnloadCommon.failIf(!isAlive, "should be alive");
58 }
59
60 ClassUnloadCommon.triggerUnloading();
61
62 {
63 boolean isAlive = wb.isClassAlive(className);
64 System.out.println("testClass (2) alive: " + isAlive);
65
66 ClassUnloadCommon.failIf(!isAlive, "should be alive");
67 }
68 c = null;
69 escape = null;
70 ClassUnloadCommon.triggerUnloading();
71
72 {
73 boolean isAlive = wb.isClassAlive(className);
74 System.out.println("testClass (3) alive: " + isAlive);
75 ClassUnloadCommon.failIf(isAlive, "should be unloaded");
76 }
77
78 }
79 }