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From "Pavel Pervov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-1932) [drlvm] ClassLoader.defineClass() method should throw LinkageError if it's called more that once for the same class.
Date Fri, 10 Nov 2006 10:15:39 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-1932?page=comments#action_12448696 ] 
            
Pavel Pervov commented on HARMONY-1932:
---------------------------------------

Patch is applied as expected. Verified on revision 473296. Thanks.

> [drlvm] ClassLoader.defineClass() method should throw LinkageError if it's called more
that once for the same class.
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-1932
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1932
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: IA32, WinXP
>            Reporter: Mikhail Markov
>         Assigned To: Gregory Shimansky
>         Attachments: H1932.patch, LinkageErrorTest.zip
>
>
> The test below called 2 times method defineClass() of ClassLoader for the same class:
> ----------------------- Test.java -------------------------
> public class Test {
>     public static void main(String[] args) throws Exception {
>         ClassLoader loader = new TestClassLoader();
>         loader.loadClass("/TestClass");
>         try {
>             loader.loadClass("/TestClass");
>             System.out.println("Test failed.");
>         } catch (LinkageError le) {
>             System.out.println("Test passed: " + le);
>         }
>     }
>     static class TestClassLoader extends ClassLoader {
>         /*
>          * Byte array of bytecode equivalent to the following source code:
>          *     public class TestClass {
>          *     }
>          */
>         private byte[] classData = new byte[] {
>             -54, -2, -70, -66, 0, 0, 0, 49, 0, 13,
>             10, 0, 3, 0, 10, 7, 0, 11, 7, 0,
>             12, 1, 0, 6, 60, 105, 110, 105, 116, 62,
>             1, 0, 3, 40, 41, 86, 1, 0, 4, 67,
>             111, 100, 101, 1, 0, 15, 76, 105, 110, 101,
>             78, 117, 109, 98, 101, 114, 84, 97, 98, 108,
>             101, 1, 0, 10, 83, 111, 117, 114, 99, 101,
>             70, 105, 108, 101, 1, 0, 14, 84, 101, 115,
>             116, 67, 108, 97, 115, 115, 46, 106, 97, 118,
>             97, 12, 0, 4, 0, 5, 1, 0, 9, 84,
>             101, 115, 116, 67, 108, 97, 115, 115, 1, 0,
>             16, 106, 97, 118, 97, 47, 108, 97, 110, 103,
>             47, 79, 98, 106, 101, 99, 116, 0, 33, 0,
>             2, 0, 3, 0, 0, 0, 0, 0, 1, 0,
>             1, 0, 4, 0, 5, 0, 1, 0, 6, 0,
>             0, 0, 29, 0, 1, 0, 1, 0, 0, 0,
>             5, 42, -73, 0, 1, -79, 0, 0, 0, 1,
>             0, 7, 0, 0, 0, 6, 0, 1, 0, 0,
>             0, 1, 0, 1, 0, 8, 0, 0, 0, 2,
>             0, 9 };
>         protected Class findClass(String name) throws ClassNotFoundException {
>             if (name.equals("/TestClass")) {
>                 return defineClass(null, classData, 0, classData.length);
>             } else {
>                 throw new ClassNotFoundException("Class " + name + " not found.");
>             }
>         }
>     }
> }
> ------------------------------------------------
> Output on RI:
> Test passed: java.lang.LinkageError: duplicate class definition: TestClass
> Output on Harmony:
> Test failed.

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