How to change SSO Login page to Custom Login Page in Oracle Application server (OAS) ?

To change SSO Login page follow the below steps:

1) The Login page is a jsp file "login.jsp" which can be found in $INFRA_HOME/j2ee/OC4J_SECURITY/applications/sso/web/jsp, you can create your own login file say "my_login_page.jsp" and place it into that directory.

2) Then go to $INFRA_HOME/sso/conf and modify "policy.properties" file (backup the original one first). You have to find the line:
loginPageUrl = /sso/jsp/login.jsp

Replace "login.jsp" with your new login file name "my_login_page.jsp"
loginPageUrl = /sso/jsp/my_login_page.jsp

3) Restart OC4J_SECURITY and HTTP_Server

You can however customize more, check [chapter 12|http://download.oracle.com/docs/cd/B14099_19/idmanage.1012/b14078/custom.htm#i1015535] in the SSO Administration Guide (Creating Deployment-Specific Pages) for more options.