void (String[] ss) { String.format("%s", <warning descr="Confusing argument 'null', unclear if a varargs or non-varargs call is desired">null</warning>); String.format("%d", 1); String.format("%s", <warning descr="Confusing argument 'ss', unclear if a varargs or non-varargs call is desired">ss</warning>); CompletableFuture[] futures = {}; CompletableFuture.allOf(futures); }