why cant you do other things when the user logges in to the application when you use j_security_check ? can you explain more what you whant to do ?
Because, the j_security_check handler is handled by the container. I don't know how to access/overwrite it and I don't know if it gives any callback handler
i still dont understand what you try to do, a use case would be nice,
yes j_security_check is hadled av the container, when you try to access a restricted url the container redirect you to the login.jsp with your j_security_check action.
do you try to login from a standalone java client or one servlet ?