Unnecessary caught ClassCastException due to incorrect instance check

[fluidsonic]

While debugging with exception breakpoints I get a lot of internally caught exceptions like this:

ClassCastException: class io.ktor.server.netty.EventLoopGroupProxy cannot be cast
to class java.util.concurrent.ScheduledThreadPoolExecutor

In the following code the executor is cast to ScheduledExecutorService but the reflected Method requires a ScheduledThreadPoolExecutor.

Looks like a bug to me.

kotlinx.coroutines/kotlinx-coroutines-core/jvm/src/internal/Concurrent.kt

Lines 23 to 38 in ae6b2c4

	private val REMOVE_FUTURE_ON_CANCEL: Method? = try {
	ScheduledThreadPoolExecutor::class.java.getMethod("setRemoveOnCancelPolicy", Boolean::class.java)
	} catch (e: Throwable) {
	null
	}
	@Suppress("NAME_SHADOWING")
	internal fun removeFutureOnCancel(executor: Executor): Boolean {
	try {
	val executor = executor as? ScheduledExecutorService ?: return false
	(REMOVE_FUTURE_ON_CANCEL ?: return false).invoke(executor, true)
	return true
	} catch (e: Throwable) {
	return true
	}
	}