I'm involved in an Java Web Application Migration project to IBM Websphere Portal (IBM WP) Platform.
The actual application in production environment validates manually user credentials (username and password) against a Database Table that stores the data. I understand that the idea behind a Portal application is that the Portal Container handles this Security issues, but I'm not sure how IBM WP can consume the credentials that now are on Database.
There's a brand new Tivoli Directory Server in the Company, and I'm aware that I can't connect IBM WP to this LDAP Server so, do I need to migrate every user in the Database to this LDAP Server, or there's a Way that Tivoli recognize the credentials that are on the database?
You can hook in any kind of custom authentication you need using a Trust Association Interceptor. Your custom authenticator would probably work a lot like the authentication code in your existing system. It would display a page prompting the user for their credentials, and then check them against the DB.
I'm not sure how this relates to your Tivoli LDAP, but there seems to be a provided TAI for TAM integration: Tivoli Access Manager Trust Association Interceptor (TAI++)