- test file upload from windows !!!
- documentation: first step, create a directory for the photo album....
- in documentation, distinguish between framework and application documentation
- show application version in Border component (subversion number?). 
- document configuration of administrator group in web.xml
- more robustness in photo albums. When a photo is not found do not return null but return a 
  dummy photo instead. 
- unit test for authorized album. 
- security: accessing a protected page: Show the use of the authorization
  service. Also update the class diagram and show the authorization service.
- concurrency design: show package name for ReentrantLock in class diagram.
- make changelog in xdoc format and included it in docs. 
- provide coding guidelines
- describe the quest from ant to maven and then back to ant 


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- submitting one or more photos whose name already exists. 
  Should prompt the user for an option to ignore the photo or to
  rename the photo. 

- download photos as zip (download link). 
  - without compression
  - with compression to a maximum size
  ===> requires information to be stored in the session
 
- view option (session based) to view photos in a certain maximum resolution (implies extra load on 
  the server, is this wise?).

- replace Image manipulation by routines that do not require X11 access
  Java2D? ImageIO?
- add an error page for catching general exceptions.