Options:
 * integrate with existing security
 * use Spring Security

----

heikki: please expand this page, stating

 1. what security are you talking about ;
 2. what are the options we have to achieve the security from the first point;
 3. how does it relate to "existing" security;
 4. is it better to use Spring security and if so, why ?
 5. are there no other options than Existing and Spring security ?