clone() works in DevMode but not in production mode

[tdk]

I have a problem with cloning a class. It works just fine in DevMode but not in deployment mode. Following is a code snippet of what I do:

SomeClass a = new SomeClass();
SomeClass b = (SomeClass)a.clone();

This works in DevMode but when its deployed it throws a ClassCastException.

Is there anything special that needs to be done to make this work correctly?

I'm using GWT 2.3 and SmartGWT 2.5