net.florianschoppmann.java:java-futures (maven):  Bridge gaps and help overcome inconveniences with CompletableFuture. This module includes, among other features, methods to collect the results of multiple futures into a list, provides equivalent alternatives to CompletableFuture’s monadic methods (thenApply, thenCompose, etc.) that can deal with checked exceptions, and methods for asynchronous “try-with-resources” constructs. 
Keywords: completablefuture