RedefineClassesDisabledTest.java revision 12973:2e63fa2efdb1 
1/*
2 * Copyright (c) 2004, 2015, 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
26 * @bug 4882798
27 * @summary test that redefineClasses and isRedefineClassesSupported behave correctly when redefine is not enabled
28 * @author Robert Field, Sun Microsystems -- as modified from the work of Gabriel Adauto, Wily Technology
29 *
30 * @run build RedefineClassesDisabledTest
31 * @run shell RedefineSetUp.sh
32 * @run shell MakeJAR.sh basicAgent
33 * @run main/othervm -javaagent:basicAgent.jar RedefineClassesDisabledTest RedefineClassesDisabledTest
34 */
35
36import java.io.*;
37import java.lang.instrument.*;
38import java.lang.reflect.*;
39public class
40RedefineClassesDisabledTest
41    extends ASimpleInstrumentationTestCase
42{
43
44    /**
45     * Constructor for RedefineClassesDisabledTest.
46     * @param name
47     */
48    public RedefineClassesDisabledTest(String name)
49    {
50        super(name);
51    }
52
53    public static void
54    main (String[] args)
55        throws Throwable {
56        ATestCaseScaffold   test = new RedefineClassesDisabledTest(args[0]);
57        test.runTest();
58    }
59
60    protected final void
61    doRunTest()
62        throws Throwable {
63        testIsRedefineClassesSupported();
64        testSimpleRedefineClasses();
65    }
66
67
68    public void
69    testIsRedefineClassesSupported()
70    {
71        boolean canRedef = fInst.isRedefineClassesSupported();
72        assertTrue("Can redefine classes flag set incorrectly (true)", !canRedef);
73    }
74
75    public void
76    testSimpleRedefineClasses()
77        throws Throwable
78    {
79        // first load the class and prove that it is the right one
80        ExampleRedefine ex = new ExampleRedefine();
81
82        // with this version of the class, doSomething is a nop
83        int firstGet = ex.get();
84        ex.doSomething();
85        int secondGet = ex.get();
86
87        assertEquals(firstGet, secondGet);
88
89        // now redefine the class. This will change doSomething to be an increment
90
91        // this class is stored in a different place (scratch directory) to avoid collisions
92        File f = new File("Different_ExampleRedefine.class");
93        System.out.println("Reading test class from " + f);
94        InputStream redefineStream = new FileInputStream(f);
95
96        byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
97
98        ClassDefinition redefineParamBlock = new ClassDefinition(   ExampleRedefine.class,
99                                                                    redefineBuffer);
100
101        // test that the redefine fails with an UnsupportedOperationException
102        boolean caught = false;
103        try {
104            fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
105        } catch (UnsupportedOperationException uoe) {
106            caught = true;
107        }
108        assertTrue(caught);
109    }
110
111}
112