[jboss-jira] [JBoss JIRA] Commented: (JASSIST-74) modifying a method containing a switch statement using IBM JVM throws ArrayIndexOutOfBoundsException

[Mooky Grand (JIRA)]

    [ https://jira.jboss.org/jira/browse/JASSIST-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12456422#action_12456422 ] 

Mooky Grand commented on JASSIST-74:
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I cannot attach the class after transformation because of the exception (the class is never written to the disk).
The compiler I'm using is IBM's compiler as noted above.

Under my WebSphere 6.1 ND installation it's available at: <installation root>/AppServer/java/bin.
Unfortunately I cannot attach the compiler/JRE.


I think I made a mistake earlier: it doesn't matter which compiler I'm using to compile, just which runtime I'm using to run javassist. When running with Sun's everything works. When usign IBM's I get the above exception. Therefore, it seems like the class files I attached won't help.


> modifying a method containing a switch statement using IBM JVM throws ArrayIndexOutOfBoundsException
> ----------------------------------------------------------------------------------------------------
>
>                 Key: JASSIST-74
>                 URL: https://jira.jboss.org/jira/browse/JASSIST-74
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.8.1.GA
>         Environment: OS: Probably all. I produced it on Windows
> JVM: does not happen with Sun JVM (at least the versions I used). Does happen with IBM's JVM. I used the following version: 
> java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build pwi32dev-20060511 (SR2))
> IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20060504 (JIT enabled)
> J9VM - 20060501_06428_lHdSMR
> JIT  - 20060428_1800_r8
> GC   - 20060501_AA)
> JCL  - 20060511a
> This version comes bundled with Websphere 6.1 ND. The Exact version that I used is "WebSphere Platform 6.1 [ND 6.1.0.0 b0620.14]"
>            Reporter: Mooky Grand
>            Assignee: Shigeru Chiba
>         Attachments: Bla.class, Bla.class, Bla.java, MyTest2.java
>
>
> First the exception that I see:
> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -2147483648
>         at javassist.bytecode.CodeIterator.insertGap2(CodeIterator.java(Compiled Code))
>         at javassist.bytecode.CodeIterator.insertGap0(CodeIterator.java:656)
>         at javassist.bytecode.CodeIterator.insertGap(CodeIterator.java:640)
>         at javassist.bytecode.CodeIterator.insertGapCore(CodeIterator.java:467)
>         at javassist.bytecode.CodeIterator.insert0(CodeIterator.java:370)
>         at javassist.bytecode.CodeIterator.insertEx(CodeIterator.java:339)
>         at javassist.CtBehavior.insertBefore(CtBehavior.java:671)
>         at javassist.CtBehavior.insertBefore(CtBehavior.java:640)
>         at sample.MyTest2.main(MyTest2.java:26)
> From the little analysis I did I discovered the following:
> 1. The problem is not reproduced using Sun's JVM.
> 2. The method being modified must be of a certain length
> 3. The method must have a switch statement.
> 4. The added code should be containe dinside a try-catch block.
> When I remove some of the repeating statements from Bla.java, the exception goes away (BTW, if I remove just one there's no exception but the resulting file is corrupted).
> Essentially, this prevents me from using Javassist under IBM's JVM for large methods that contain switch statements.
> I've reproduced this problem using javassist 3.4, 3.8 & 3.9.

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