Steps to reproduce:
1) mount kawt_midp.zip (http://www.trantor.de/kawt/)
2) browse java.* package (or CompileAll on java package)
3) see an exception

Reason:
ClassDataObject uses InstanceSupport but there is a special hack in 
java.lang.ClassLoader which prevents InstanceSupport
from working with J2ME classes. ClassLoader throws a SecurityException if
someone tries to load classes from packages java.* (all subpackages of java), 
the exception is propagated to ClassDataObject (I'm not sure if JavaDataObject 
has the same problem too) and there is not handled. Public API of J2ME (CLDC) is 
subset of J2SE, but it also contains private (package private) classes which are 
not part of J2SE (null classloader) but must be loaded from filesystem 
(NbClassLoader) and it causes the exception.

Possible solution:
1) add check for SecurityException into InstanceSupport.findClass and if it has 
been caused by a class from java. change it to ClassNotFoundException.
2) handle SecurityException in all classes that use InstanceSupport. In such a 
case it should be documented in InstanceCookie.

it is not possible to fix NbClassLoader because ClassLoader.defineClass which 
causes the exception is final :(((