java - Calling Java8 method with BiFunction parameter fro Groovy -

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i have piece of groovy code makes use of java8 completablefutures:

       completablefuture<integer> future1 = completablefuture.supplyasync({             thread.sleep(1500)             return 1         })          completablefuture<integer> future2 = completablefuture.supplyasync({             thread.sleep(1000)             return 2         })          def closure = { integer a, integer b -> + b }         completablefuture<integer> result = future1.thencombineasync(future2, closure)         println(result.get())

problem can't call thencombineasync in 2nd last line work. whatever do, second argument, required bifunction, not accepted compiler types don't match. i've tried lot of things. solution gets accomplished appreciated.


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