Hi - I am building a user-group-role database on SQL server, and using Tomcat JDBCRealm to authenticate user logins to my webapp against this database (easy to set up - works well). I would now also like to use the Tomcat admin client (in V4.1 and V5) to create and edit the users / groups / roles stored in this SQL server database - ie. to replace the tomcat-users.xml file which is managed by the admin client using a MemoryUserDatabase. Has anyone tried anything like this, if so ... 1. Are there any "JDBC" or "SQL" UserDatabase classes I can use to do this (rather than MemoryUserDatabase). 2. If not, and I wrote my own implementation, what else would I need to configure to plug it into Tomcat ?