a4j:support tag not found using JSF 2

Question

just trying to integrate this commandLink

Answer 1

The a4j:support has been replaced by a4j:ajax since RichFaces 4.x.

You seem to be reading RichFaces 3.x documentation or just have upgraded RichFaces 3.x to 4.x. This is a pretty major step where a lot of things are been changed. Read the migration guide (in this particular case, it's described in a4j components) and also read the new RF4 component reference.