Netbeans Platform creators recommend wrapping all external JARs into dedicated module. I don’t want to. I just want to include it in my module. The way to do it (described here) is to put all needed jars in release/modules/ext folder and adding some extra XML to project.xml
<class-path-extension>
<runtime-relative-path>ext/hexedit.jar</runtime-relative-path>
<binary-origin>release/modules/ext/hexedit.jar</binary-origin>
</class-path-extension>
Repeat this section for every jar put in ...ext folder.
Immediately you should see them in Libraries folder of you Project's view.
I’m during exploring Netbeans Platform architecture. I like it very much. As I already have a Netbeans Platform Certified Associate certificate, I plan to gain higher level Netbeans Certified Engineer.
To achieve that I have to write a Netbeans Platform plugin. It will be a IM client with various awesome features 
My plans were commented by Geertjan Wielenga (Netbeans Documentation and Tutorials master writer) whom I met personally. Geertjan said that my plugin would qualified me as a Certified Engineer. Awesome! 
So I’m developing it right now, at 1:20am as this is the only time when I don’t have to look after my children 
I plan to put some early screenshots as soon as there will be something good to show.