Sadly not in maven repo yet so my company can't use it. I have played around some with functional java (functionaljava.org) and Op4j. Have you compared bolts to either of those?
As far as I know, functional java was used as inspiration, but bolts were much more suitable for day to day tasks (a lot of pragmatic code already there).
No idea about the recent development in fj, they probably made some improvements in the meantime, too.
Bolts are the state of art FP library for java.
https://bitbucket.org/stepancheg/bolts/src/tip/src/main/java... some examples in tests