Throwing exception from lambda [duplicate]

Answer 1

The problem is indeed that all @FunctionalInterfaces used in lambdas do not allow exceptions to be thrown, save for unchecked exceptions.

One solution is using a package of mine; with it, your code can read:

sessions.parallelStream()
    .map(Session::getBasicRemote)
    .forEach(Throwing.consumer(basic -> basic.sendText(message)));
return this;