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.
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  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 
  36 import java.io.*;
  37 import java.lang.instrument.*;
  38 import java.lang.reflect.*;
  39 public class
  40 RedefineClassesDisabledTest
  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 }