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 KeepAliveSoftReference
26 * @summary This test case uses a java.lang.ref.SoftReference referencing a class instance to keep a class alive.
27 * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
28 * @library classes
29 * @build KeepAliveSoftReference test.Empty
30 * @build ClassUnloadCommon
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveSoftReference
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 KeepAliveSoftReference {
42 private static final String className = "test.Empty";
43 private static final WhiteBox wb = WhiteBox.getWhiteBox();
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 SoftReference<Object> sr = new SoftReference(o);
50 o = null; c = null; cl = null;
51
52 {
|
1 /*
2 * Copyright (c) 2014, 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 KeepAliveSoftReference
26 * @summary This test case uses a java.lang.ref.SoftReference referencing a class instance to keep a class alive.
27 * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
28 * @library classes
29 * @build KeepAliveSoftReference test.Empty
30 * @build ClassUnloadCommon
31 * @run main/othervm/bootclasspath -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveSoftReference
32 */
33
34 import java.lang.ref.SoftReference;
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 KeepAliveSoftReference {
41 private static final String className = "test.Empty";
42 private static final WhiteBox wb = WhiteBox.getWhiteBox();
43
44 public static void main(String... args) throws Exception {
45 ClassLoader cl = ClassUnloadCommon.newClassLoader();
46 Class<?> c = cl.loadClass(className);
47 Object o = c.newInstance();
48 SoftReference<Object> sr = new SoftReference(o);
49 o = null; c = null; cl = null;
50
51 {
|