I'm using IntellIJ with Apache Wicket and IntelliJ is showing me that tags like <wicket:extend> and <wicket:container> and adding wicket:id to other html tags is not valid.
What steps do I need to take to make IntelliJ recognize the wicket tags?
I'm using IntelliJ Ultimate 9 with the wicketforge plugin.
I use Eclipse, but to make validation errors go away, I just add the wicket namespace:
<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd" >
...
</html>
You can't really do it, adding the wicket namespace as in the other answer will only work for wicket:id, there is no dtd that also includes the wicket:container|panel etc.
There is this really old schema from the contrib project: http://wicket-contrib.googlecode.com/files/wicket.xsd but that doesn't include xhtml, so you'd need to create a schema to merge that and xhtml, and i don't believe there is a way other then manual.
The best you can do it add them to idea's ignored tags;