cannot run sevlets :-(

  Hi !
 I cannot run servlets, I am getting pages with saying that the 
servlet is not configurated ok or with java errors from the server 
(illegal argument...)
 I use know jdk1.1.1 (because I understood that with jdk1.2 it is not 
still working), with the jsdk classes taken from the jdk1.2 package. 
Is this a problem ?
                       Manu.