I test coroutineExceptionHandler.

Here is my code.

    fun createExceptionHandler(name: String) = CoroutineExceptionHandler { context, throwable ->
        println("[${Thread.currentThread().name} - $name] Caught $throwablen${context[CoroutineExceptionHandler]}")
    }

    @Test
    fun coroutineScope_exceptionHandle() = runBlocking<Unit> {
        val coroutineScope = CoroutineScope(Job() + createExceptionHandler("supervisor"))
        coroutineScope.launch(createExceptionHandler("launch1")) {
            launch(CoroutineName("launch2") + createExceptionHandler("launch2")) {
                throw Exception("[${Thread.currentThread().name}] Error !")
            }
            launch(CoroutineName("launch3")) {
                println("[${Thread.currentThread().name}] launch3")
            }
        }
        delay(1000L)
    }

Result:

[DefaultDispatcher-worker-3 @launch3#6] launch3
[DefaultDispatcher-worker-2 @launch2#5 - launch1] Caught java.lang.Exception: [DefaultDispatcher-worker-2 @launch2#5] Error !
...

I expect the exception handled by coroutineScope’s handler named supervisor.

Could you please explain why the exception handled by launch1 handler?