SAPGUI Java transaction problem

My configuration:

Sapgui java 6.4 rev2

SuSe 9.3 Pro (java 1.4.2)

All is good except certain transactions !!

When I try : Vaxx (VA15 - VA25 ...) I have an error:

ABAP_RAISE_EXCEPTION

Causes : The current ABAP/4 program encoutered an unexpected

...

All transactions are OK with Windows SAPgui !!!

Is there somebody who know that problem ?

Regards