Exception Handler 🔗

How to customize the Exception handler?

Use the exceptionMapper parameter of UndertowSharafServer:

            val customExceptionMapper: ExceptionMapper = {
  case e: MyException =>
    val errorPage = MyErrorPage(e.getMessage())
    Response.withBody(errorPage)
      .withStatus(StatusCode.InternalServerError)
}
val finalExceptionMapper = customExceptionMapper.orElse(ExceptionMapper.default)

val server = UndertowSharafServer(
    "localhost",
    port,
    routes,
    exceptionMapper = finalExceptionMapper
  )

          

The ExceptionMapper is a partial function from an exception to Response.
Here we need to chain our custom exception mapper before the default one.