Best way to correct bugs in javalibs

[Guillaume Rousse]

Hello.
I've begun java implementation of pleac project (see 
http://lis.snv.jussieu.fr/~rousse/linux/pleac), and i test all code with 
current 1.0.6 kaffe, reporting which are OK and which fails. 
This made me find some interesting bugs, probably in java library 
implementations. So i downloaded the javalibs source from kaffe cvs, and 
attempted to correct them myself. But i don't understand how to proceed to 
easily modify and test basic classes from java package. Can someone briefly 
expose me what to do ? Thanks.
-- 
Guillaume Rousse <rousse@ccr.jussieu.fr>
GPG key http://bohm.snv.jussieu.fr/~rousse/gpgkey.html