Plugin Development in Netbeans

I would like to develop a simple 'hello world' plugin in OpenFire( using Netbeans).
I read that making plugins requires the whole openfire Source to be available, so I downloaded that.  I am following these steps:

My openfire_src folder is in this location - C:\Users\Harsh\Desktop\openfire_src

1. Create a new project like this;
   
2. Select the folder (please see the settings here as well)
   
3. Click next without changing anything:
   
   
   
   
4. Again, click next without changing anything:
   
   After that, I am taken to the Java Sources Classpath window
   
   
5. In the Java Sources Classpath Window, I choose All the jars from the src\build\lib\ folder, and all the jars inside the sub folders as well (ant,dist,merge,src)   
   
   
6. Then here, i just click next ( no changes)
   
   
   
7. After clicking on finish, I get a ton of errors like this :
   

This is one of the many errors:

I am using Netbeans and windows.
My main objective is to be able to make a plugin for openfire. Thank you in advance for your help.