If you are using XI 3.1, I suggest you have a look at the Pattern book for Windows:
https://websmp107.sap-ag.de/~sapidb/011000358700000532872009E/xi31_bip_pattern_win_en.pdf
If you are on SP2, I’d suggest testing Tomcat 6 as the clustering support is supposed to be better.
There is some help on upgrading your tomcat server here:
https://bobj-board.org/t/135125
HTH
Hayden
Hayden_Gill 
(BOB member since 2002-08-15)