Hi Krzysiek,
Welcome in the XWiki community !
We'll need mode details than "some problems" to help you :) What error
do you get exactly ?
Note that you usually don't to build XWiki entirely to work on it,
usually you build only the module you are working on and let Maven
download the rest. Plus here the goal is to work on an extension to
install in a released version of XWiki.
On Tue, Mar 21, 2017 at 2:31 PM, Krzysiek Płachno
<krzysiekplachno(a)gmail.com> wrote:
  Hello!
 I'm last year student of Computer Science Master at AGH University of
 Science and Technology in Cracow, Poland.
 I'd like to take part in GSoC working on XWiki. I've never heard about
 XWiki before, and I got very interested with the idea of "Second generation
 wiki". And so, I'd like to contribute to this fancy idea, and get to know
 the project better.
 The task that I'd like to take is "More extension repositories". I'm a
Java
 EE Developer with one year experience of working in real world company.
 Frameworks that I worked with: Spring, Hibernate and many other smaller
 ones. Of course I worked with REST and Http protocol, so I think I'm quite
 prepared to the task.
 I spent some time trying to build locally XWiki Platform system - on both
 Windows and Linux environments and there're always some problems. I
 followed all instructions given here:
 
http://dev.xwiki.org/xwiki/bin/view/Community/Building.
 <http://dev.xwiki.org/xwiki/bin/view/Community/Building#HTroubleshooting>
 Do you have something like configured Virtual Machine on which I can run
 building seamlessly? Or do you have some troubleShooting wiki, when you
 post solution to common problems. (I guess mailing list is not the best
 place for pasting logs and asking for help, right?)
 Best,
 Krzysztof Płachno 
--
Thomas Mortagne