I am writing the function that can catch exceptions of the certain type only.
def myFunc[A <: Exception]() {
try {
println("Hello world") // or something else
} catch {
case a: A => // warning: abstract type pattern A is unchecked since it is eliminated by erasure
}
}
What is the corrent way to bypass jvm type erasure in such case?
You could use ClassTag
like in this answer.
But I'd prefer this approach:
def myFunc(recover: PartialFunction[Throwable, Unit]): Unit = {
try {
println("Hello world") // or something else
} catch {
recover
}
}
Usage:
myFunc{ case _: MyException => }
Using ClassTag
:
import scala.reflect.{ClassTag, classTag}
def myFunc[A <: Exception: ClassTag](): Unit = {
try {
println("Hello world") // or something else
} catch {
case a if classTag[A].runtimeClass.isInstance(a) =>
}
}
Note also that in general you should use Try
with recover
method: Try
will catch only NonFatal
exceptions.
def myFunc(recover: PartialFunction[Throwable, Unit]) = {
Try {
println("Hello world") // or something else
} recover {
recover
}.get // you could drop .get here to return `Try[Unit]`
}