prolog is nice, becouse some situations/relations are easy to calculate in it, but:
Have someone using prolog language in java game programming before? is it useful? is it slow?
Ugh, I coded prolog looong ago in school… Its very convenient for certain data crunching stuff… But the lack of libraries and compatibility will probably not give you much joy I guess… Even well-supported languages like Scala make you hunt for libraries, adapt and wrap others and find compatible tools, plugins etc. so that the advantage in the actual coding is practically nullified…
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Due to the excessive use of recursion prolog is slow as hell.
I strongly recommend NOT to use prolog.
In fact my professor for theoretical computer science said, prolog is more an experiment and not a productive language.
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thank you for reply, now i understand why its not common
and i expected that it is slow, but not as hell 
Prolog is actually “fast enough” for some tasks (relative to the coding efficiency), but it’s pretty specific tasks!
I’ve used it for coding intelligent agents at a uni course where it was quite useful and I remember there were some libraries for using it with Java, although I personally haven’t used any since I decided to go with pure Java for my exam agent.
It’s probably not a great option for most game applications, for sure, but a nice and interesting language none the less.