如何在Scala中声明复合序列化程序

但我不知道如何申报复合物 我试过了

及

但是什么都不起作用

import me.prettyprint.cassandra.serializers._
import me.prettyprint.hector.api._
import me.prettyprint.hector.api.factory.HFactory

val se = StringSerializer.get()
val le = LongSerializer.get.asInstanceOf[Serializer[Long]]
val be = BooleanSerializer.get.asInstanceOf[Serializer[Boolean]]

val ce = CompositeSerializer.get

val ce = CompositeSerializer.get.asInstanceOf[Serializer[Composite]]