ProcessRunners call method throws Exception

[WaDelma]

It should propably throw all the specific exception that it has to throw.
Encountered to a bug where catching all exceptions ate NullPointerException.

[jamo]

The signature for Callable#call is V call() throws Exception.
Thus we basically need to catch of throw Exception, even though it's kinda ugly.

However, we should take care to never silently swallow the exceptions, but to always at least log the exception.

[WaDelma]

Well I tried to change it to specific exception types and it didn't complain about it...