1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  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
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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  * @modules java.instrument
  31  * @run build RedefineClassesDisabledTest
  32  * @run shell RedefineSetUp.sh
  33  * @run shell MakeJAR.sh basicAgent
  34  * @run main/othervm -javaagent:basicAgent.jar RedefineClassesDisabledTest RedefineClassesDisabledTest
  35  */
  36 
  37 import java.io.*;
  38 import java.lang.instrument.*;
  39 import java.lang.reflect.*;
  40 public class
  41 RedefineClassesDisabledTest
  42     extends ASimpleInstrumentationTestCase
  43 {
  44 
  45     /**
  46      * Constructor for RedefineClassesDisabledTest.
  47      * @param name
  48      */
  49     public RedefineClassesDisabledTest(String name)
  50     {
  51         super(name);
  52     }
  53 
  54     public static void
  55     main (String[] args)
  56         throws Throwable {
  57         ATestCaseScaffold   test = new RedefineClassesDisabledTest(args[0]);
  58         test.runTest();
  59     }
  60 
  61     protected final void
  62     doRunTest()
  63         throws Throwable {
  64         testIsRedefineClassesSupported();
  65         testSimpleRedefineClasses();
  66     }
  67 
  68 
  69     public void
  70     testIsRedefineClassesSupported()
  71     {
  72         boolean canRedef = fInst.isRedefineClassesSupported();
  73         assertTrue("Can redefine classes flag set incorrectly (true)", !canRedef);
  74     }
  75 
  76     public void
  77     testSimpleRedefineClasses()
  78         throws Throwable
  79     {
  80         // first load the class and prove that it is the right one
  81         ExampleRedefine ex = new ExampleRedefine();
  82 
  83         // with this version of the class, doSomething is a nop
  84         int firstGet = ex.get();
  85         ex.doSomething();
  86         int secondGet = ex.get();
  87 
  88         assertEquals(firstGet, secondGet);
  89 
  90         // now redefine the class. This will change doSomething to be an increment
  91 
  92         // this class is stored in a different place (scratch directory) to avoid collisions
  93         File f = new File("Different_ExampleRedefine.class");
  94         System.out.println("Reading test class from " + f);
  95         InputStream redefineStream = new FileInputStream(f);
  96 
  97         byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
  98 
  99         ClassDefinition redefineParamBlock = new ClassDefinition(   ExampleRedefine.class,
 100                                                                     redefineBuffer);
 101 
 102         // test that the redefine fails with an UnsupportedOperationException
 103         boolean caught = false;
 104         try {
 105             fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
 106         } catch (UnsupportedOperationException uoe) {
 107             caught = true;
 108         }
 109         assertTrue(caught);
 110     }
 111 
 112 }