Hi Renu
Please have a search of the HANA posts in this space. When looking into HANA you can also consider the application layer/functional side such as Simple Finance, HR Renewal, S4HANA, etc. There is a lot of change happening because of HANA. It's not just technical
The other thing to consider is looking at UX. If your background is portal and you see it's days are limited (bit of debate there) then you could look at Fiori, Personas and NWBC are areas to develop
It's a bit difficult to say which of the 4 you have listed as a best match to your skills as your skill summary is quite high level. When you say Java what do you mean by that? Are you a java developer/programmmer or worked on java platform (e..g Enterprise Portal)
Regards
Colleen