URGENT! loadjava problem

Hi, I'm new with Java Stored Procedure and I'm trying to load java classes in Oracle 8.1.6 with the following command:

loadjava -u username/pwd -v -r classname.class

but i continue receiving this error:

ORA-29545:badly formed class - java.Lang.NullPointerException
ORA-29552: Verification Warning -java.Lang.NullPointerException

I saw in metalink it should be a resolver problem but I've no skill in it.
Please can anyone help me? It's URGENT! I've my application stopped

Thanks

can u please send me the code so that i may help u,
as by just looking at the error its difficult for me to
give u any solution to it.