core.DefaultClassMapper.mapNameFromXML(String) has problems with '_'

Thanx for sharing XStream. Thanx for sharing it w/ BSD license.

I tried to invoke <XStream instance>.fromXML(Reader) with classes named PL_Group, PL_System, etc.

I got ArrayIndexOutOfBoundException inside core.DefaultClassMapper.mapNameFromXML(String). Apparently, when mapNameFromXML() is trying to do
<code>
xmlName.substring(i + 1, i + 8).equals("DOLLAR_")
</code>
XStream assumes incorrectly that the String will be longer than 8.

I propose surrounding the block with try/catch.

Regards,

-Eddy