|
No as far as i know, it is totally open-source. The only problem i have seen is that its user guide which is a very valuable resource is to be bought. It is not a too big amount but If you can not buy the user guide then try searching it on google. You will find a little bit older versions of this user guide but i think it is more than enough for any purposes to start. At the end, if you learn basics you can easily obtain missing info there by looking at javadocs..
Good luck.
|