BCEL instrumentation -> ClassFormatError

Hello All,

I'm working on a "kind-of" dynamic java bytecode instrumenter using BCEL and
java.lang.instrument. I'm adding a list of instructions at specific
positions in the classfiles (using "insert" method in InstructionList
class), but when I run the instrumentation agent, I keep getting this
exception (class Test is the one I'm trying to instrument):
   Exception in thread "main" java.lang.ClassFormatError: Invalid code
attribute name 
   index 66 in class file Test
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Can anyone help me in figuring out why this exception is being thrown and
how I can fix it ??

Thank you all in advance,
Marwa Ghali

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