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

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.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.