We are upgrading to 14.3 with Jboss 7.2 . On accessing the public page for the first time, we are getting the jsessionid appended and index.jsp removed in the URL. On the next attempt onward, it is redirecting properly.
The same configuration is working fine for CA IDM 14.2 with Jboss 6.4.
Implement the fix as recommend by RedHat:
Modify the web.xml:
<session-config> <tracking-mode>COOKIE</tracking-mode></session-config>
See this RedHat solution for details (your RedHat login account may be required):