Issues with deploying a netbeans rcp app with jnlp

Hello ,

I have a Netbeans RCP application that I want to deploy using JNLP.  It was written a few years ago and now i am 'reviving' it.  The deployment used to work at that time (3-4 years ago)  so my assumption is that the problems are related to some changes caused by the newer versions of Netbeans (8.2) and/or JDK (1.8 ).

*  First of all  : build jnlp (building the war file) takes a lot of time , aprox 10 minutes.  In comparision : clean+build the same application takes 9 seconds  .  Is this normal ?   Is there anything that can be done to speed up the build jnlp ?   
It seems to be processing all the jars of the platform each time when doing jnlp build  , again and again   - even if obviously the changes are only in my own modules (i am not touching anything in the platform)    . 

*  During 'build jnlp'  i am getting a lot of warnings about missing a timestamp when signing jars. I've found on the Internet some suggestion  about going to project properties and the 'web start' tab and configure the signing there .   But I haven't been able to find that tab.  Did it exist in older NB versions and was ... removed ? 

* After building the war file and deploying it into glassfish ,    when accessing the jnlp from browser there is an error about codebase having a wrong value $$codebase . 


Thanks for any tip or suggestion ,
Adrian