You will need to decide if you are creating a local session (domino on same box as your jsp container) or a remote session. For local sessions you will need to use Notes.jar, and for remote session you use NCSO.jar. The article you refer to discusses this; you need to add these files to your environment, they are not part of a JVM.
You might want to look into the Domino JSP tag library, which uses domtags.jar. The Notes Designer help file has some material to get you started, and there are folks here who can help if you need it.