I installed this ASN.1 editor plugin to in my Eclipse and i wrote this code
Editor http://asneditor.sourceforge.net
-- Created: Mon May 06 19:38:15 CEST 2013 ASN-Module DEFINITIONS AUTOMATIC TAGS ::= BEGIN
Client ::= SEQUENCE { lientNumber INTEGER}
Server ::= SEQUENCE { lientNumber INTEGER, serverString String } END
But I don't found how to use this Editor to generate the java Classes corresponding to my ASN.1 description