Are you trying JBM 2.0 or 1.4? I know jbm 1.4 has no direct compress/decompress utilities. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4210372#4210372 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4210372