One thing I've found useful about learning Wicket in NetBeans IDE is the IDE's code completion functionality. For example, here I'm creating a new Wicket component in the Source Editor, but I'm too lazy (or ignorant) to type the whole component type -- so, all I do is click Ctrl-Space and the code completion popup appears, displaying all the possible ways to complete the already-typed code, together with the related Javadoc:
To set Wicket's Javadoc up in the IDE, go to the Library Manager, select the 'wicket' library (or whatever you've called the library that contains all the Wicket JARs) and use the Javadoc tab to add the folder that contains the Javadoc:
That's it. Now you've made Wicket's Javadoc available to the IDE, and you can read the related Javadoc while using code completion inside the IDE.