Hello Rolf,
I have been waiting for years that there will be a modern EE6 support in NWDS 7.x.
But nothing happend. Now my decision for the future concerning java developement and runtime-environment is clear. If possible, I would change the EE-based sever technology.
There are lots of really convincing alternativ EE 6/7 server on the market. The communication to the SAP-Backend is possible via GateWay (RestFul-Services) or WebServices.
And I think, they are much better supported concerning the implementation of popular java standards.
Sorry, but this is my personal opinion, after years hoping and waiting ... .
Best regards
Steffen