FutureReturnValueIgnored
Return value of methods returning Future must be checked. Ignoring returned Futures suppresses exceptions thrown from the code that completes the Future.

Severity
WARNING
Tags
FragileCode

The problem

Methods that return java.util.concurrent.Future and its subclasses generally indicate errors by returning a future that eventually fails.

If you don’t check the return value of these methods, you will never find out if they threw an exception.

Nested futures can also result in missed cancellation signals or suppressed exceptions - see Avoiding Nested Futures for details.

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("FutureReturnValueIgnored") to the enclosing element.