Custom Exception in scala

Question

how can i create custom exceptions in Scala extending Exception class and throw them when exception occurs as well as catch them.

example in java :

Answer 1

final case class CustomException(private val message: String = "", 
                           private val cause: Throwable = None.orNull)
                      extends Exception(message, cause) 

Just try catch:

try {
    throw CustomException("optional")
} catch {
    case c: CustomException =>
          c.printStackTrace
}