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.
  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 5067523
  27  * @summary insure redefine is supported. exercise a class, then redefine it and do it again
  28  * @author Gabriel Adauto, Wily Technology
  29  *
  30  * @modules java.instrument
  31  * @run build RedefineClassesTests
  32  * @run shell RedefineSetUp.sh
  33  * @run shell MakeJAR.sh redefineAgent
  34  * @run main/othervm -javaagent:redefineAgent.jar RedefineClassesTests RedefineClassesTests
  35  */
  36 
  37 import java.io.*;
  38 import java.lang.instrument.*;
  39 import java.lang.reflect.*;
  40 public class
  41 RedefineClassesTests
  42     extends ASimpleInstrumentationTestCase
  43 {
  44 
  45     /**
  46      * Constructor for RedefineClassesTests.
  47      * @param name
  48      */
  49     public RedefineClassesTests(String name)
  50     {
  51         super(name);
  52     }
  53 
  54     public static void
  55     main (String[] args)
  56         throws Throwable {
  57         ATestCaseScaffold   test = new RedefineClassesTests(args[0]);
  58         test.runTest();
  59     }
  60 
  61     protected final void
  62     doRunTest()
  63         throws Throwable {
  64         testIsRedefineClassesSupported();
  65         testSimpleRedefineClasses();
  66         testUnmodifiableClassException();
  67     }
  68 
  69 
  70     public void
  71     testIsRedefineClassesSupported()
  72     {
  73         boolean canRedef = fInst.isRedefineClassesSupported();
  74         assertTrue("Cannot redefine classes", canRedef);
  75     }
  76 
  77     public void
  78     testSimpleRedefineClasses()
  79         throws Throwable
  80     {
  81         // first load the class and prove that it is the right one
  82         ExampleRedefine ex = new ExampleRedefine();
  83 
  84         // with this version of the class, doSomething is a nop
  85         int firstGet = ex.get();
  86         ex.doSomething();
  87         int secondGet = ex.get();
  88 
  89         assertEquals(firstGet, secondGet);
  90 
  91         // now redefine the class. This will change doSomething to be an increment
  92 
  93         // this class is stored in a different place (scratch directory) to avoid collisions
  94         File f = new File("Different_ExampleRedefine.class");
  95         System.out.println("Reading test class from " + f);
  96         InputStream redefineStream = new FileInputStream(f);
  97 
  98         byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
  99 
 100         ClassDefinition redefineParamBlock = new ClassDefinition(   ExampleRedefine.class,
 101                                                                     redefineBuffer);
 102 
 103         fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
 104 
 105         int thirdGet = ex.get();
 106         ex.doSomething();
 107         int fourthGet = ex.get();
 108         assertEquals(thirdGet + 1, fourthGet);
 109     }
 110 
 111     public void
 112     testUnmodifiableClassException()
 113         throws Throwable
 114     {
 115         System.out.println("Testing UnmodifiableClassException");
 116 
 117         // Load any class
 118         File f = new File("Different_ExampleRedefine.class");
 119         InputStream redefineStream = new FileInputStream(f);
 120         byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
 121 
 122         System.out.println("Try to redefine class for primitive type");
 123         try {
 124             ClassDefinition redefineParamBlock =
 125                 new ClassDefinition( byte.class, redefineBuffer );
 126             fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
 127             fail();
 128         } catch (UnmodifiableClassException x) {
 129         }
 130 
 131         System.out.println("Try to redefine class for array type");
 132         try {
 133             ClassDefinition redefineParamBlock =
 134                 new ClassDefinition( byte[].class, redefineBuffer );
 135             fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
 136             fail();
 137         } catch (UnmodifiableClassException x) {
 138         }
 139 
 140     }
 141 
 142 }