Don t you have to await the future I would guess something l

Question

Don t you have to await the future I would guess something like this will throw ``` fun main args Array lt String gt val f = future throw RuntimeException Hello f await ```

Ian · Answer

No I don t think you need to await the future `future ` will start the coroutine But I can see why the exception would be swallowed I m just not sure what the solution is to avoid exceptions being silently swallowed this

adeln · Answer

isn t it the same as throwing an exception in a newly created thread

uli · Answer

nope I think the exception is caught on the background thread saved and then thrown on await

uli · Answer

when you await the future you can see it being thrown on the main thread ``` Exception in thread main java lang RuntimeException Hello at GlobalKt$main$1$f$1 doResume global kt 31 at kotlin coroutines experimental jvm internal CoroutineImpl resume CoroutineImpl kt 54 at kotlinx coroutines experimental DispatchedContinuation$resume$1 run CoroutineDispatcher kt 152 at java util concurrent ForkJoinTask$RunnableExecuteAction exec ForkJoinTask java 1423 at java util concurrent ForkJoinTask doExec ForkJoinTask java 289 at java util concurrent ForkJoinPool$WorkQueue runTask ForkJoinPool java 902 at java util concurrent ForkJoinPool scan ForkJoinPool java 1689 at java util concurrent ForkJoinPool runWorker ForkJoinPool java 1644 at java util concurrent ForkJoinWorkerThread run ForkJoinWorkerThread java 157 ```

Ian · Answer

I m wondering if I should be using `runBlocking` instead of `future` since the code just needs to get executed I don t care about the result

uli · Answer

then you could use launch but an exception in a coroutine is treated like a result So launch as well as future will not throw the exception on the main thread

uli · Answer

I am not yet sure what you are trying to do If you were using future just to have an environment in which you can await other futures runBlocking might be OK runBlocking as it s name sugests will block your current thread though