a) Look for the line in jserv.conf file under $IAS_ORACLE_HOME/Apache/Jserv/etc/
#ApJServGroup FormsGroup 1 1 /u02/oracle/visora/iAS/Apache/Jserv/etc/forms.properties
If using servlets, above line will be uncommented.
b) Check the appsweb.cfg under OA_HTML/bin for the following line
if using Servlets ,below line will be uncommented.
; serverURL=/forms/formservlet