Type casting using type parameter

Type casting using type parameter

Given is a Java method that returns java.lang.Objects for a given string.
I'd like to wrap this method in a Scala method that converts the returned
instances to some type T. If the conversion fails, the method should
return None. I am looking for something similar to this:
def convert[T](key: String): Option[T] = {
val obj = someJavaMethod(key)
// return Some(obj) if obj is of type T, otherwise None
}
convert[Int]("keyToSomeInt") // yields Some(1)
convert[String]("keyToSomeInt") // yields None
(How) Can this be achieved using Scala's reflection API? I am well aware
that the signature of convert might have to be altered.