Is it possible to use VI or VIM keymap in NetBeans?

Check jVi, a Vi emulator for NetBeans.

I've also found ViEx, the project seems to be pretty active...

jVi can be installed using the NetBeans plugin manager; from NB do

Menu>Tools>Plugins

Select the tab "Available Plugins", in search enter "jvi". First install "jVi for NB-xx Update Center", then you can install jVi.