org.apache.cxf.interceptor.Fault: Unmarshalling Error: Unable to create an instance of scala.collection.immutable.List

Problem: Trying to call CXF Service, which is calling scala functions utilizing scala List object and getting the error org.apache.cxf.interceptor.Fault: Unmarshalling Error: Unable to create an instance of scala.collection.immutable.List when calling the CXF service

 

Solution:

Basically CXF unable to marshall the request to cala List object. Check for the scala function where you are using Scala List object, change it to java.util.List object by explicitly mentioning the List  object as java.util.List. Also, in the files where you are doing this,

import scala.collection.JavaConversions._

which works in scala 2.8 and above