Coroutines Handle Exception

[Kotlin-GDE]

hi

this is a snapshot of my test:

suspend fun getSum(): Int {
    var sum = 0
    repeat(3) {
        delay(500)
        sum += it

        if (it == 2)
            throw RuntimeException("Exception")
    }

    return sum
}

fun main() = runBlocking {

    val res = async {
        getSum()
    }

    val sum = runCatching { res.await() }
    if(sum.isSuccess) println("sum is: ${sum.getOrNull()}") else println("error sum: ${sum.exceptionOrNull()?.message}")

    println("end")
}

i expected with runCatching {..} i avoid exception trace but i already see exception trace still printed and my execution finish with code 1 (expected 0)

whats wrong and how to handle exception with coroutines (without using GlobaleScope)

[fvasco]

https://github.com/Kotlin/kotlinx.coroutines/blob/master/docs/composing-suspending-functions.md#structured-concurrency-with-async

See also #763