title: Migrating from JSF 1.2 to JSF 2.0
body: <p>I am working with a rather large app written in <strong>JSF 1.2</strong>.
  JSF 1.2 is around 6 years old now. I need to upgrade to JSF 2.0. How painful will this be? I noticed that some attributes in custom tags have been changed etc. </p>