title: Seam 2.0 to 2.1 (2.2) migration
body: <p>I was curious what kinds of obstacles have you encountered when migrating my app from seam 2.0 to 2.1.</p>
  
  <p>Obvious ones are mentioned in: <a href="http://anonsvn.jboss.org/repos/seam/tags/JBoss_Seam_2_1_0_SP1/seam21migration.txt" rel="nofollow noreferrer">migration guide</a>, but I encountered some problems with rule based security, that are not mentioned there. </p>
  
  <p>Firstly I want to post descriptions of my problems and my solutions with migration, so people can benefit (I did'nt find any solutions on the web) --- i'll post it as an answer :)</p>
  
  <p>Secondly I would like to ask you what problems you had when migrating, and how you solved it, so it is in one place in the web.</p>