scala - get class from a string

From Scala, I'm using a Java library that expects a class argument. Example:

def service: OAuthService  = new ServiceBuilder()
                                    .provider(classOf[RunApi])

RunApi is Java class.

I'd like to be able pass a variety of classes to provider though. I have a list of them in String format.

Example, if I know the RunApi in String format; e.g. "com.me.RunApi", how can construct the equivalent to above code?