Can someone please create a tomcat realm for authentication to crowd. It would make sense for this to work with tomcat 6. The current way of creating SSO between crowd and custom applications is not satisfactory for clients who purchase crowd and already have custom applications. I would have to alter at least 30 projects to achieve SSO with crowd. Not to mention the countless jars that are needed to achieve that solution. I would be very suprised if there were not some kind of dependency issues.
I am open to other suggestions but the realm seems the most logical way of offering a solution to parties with existing applications.
Unfortunately we will not be looking to implement this feature in the near future.
In the short-medium term, the Crowd team will be focused on improving user management integration between Atlassian applications.
As David O'Flynn mentioned, it's possible to use the Crowd REST API to write a realm implementation that backs off Crowd.