@karelpeeters thanks my main problem is that

fun processIncomingMessages(incomingMessage: List<IncomingMessage>)

is actually a function that thats a list of

SomeOtherType

but not

IncomingMessage

.

SomeOtherType

is just a json message, so I need to process each json message and wrap them in a IncomingMessage class. So it's actually look more like this this ( I try to use jacksonmapper library)

// example incoming messages:
    //  {"message":"message1", phoneType":"iPhoneX", "test1"},
    //  {"message":"message1", phoneType":"Samsung1", "test2"}

    fun processIncomingMessages(incomingMessage: List<SomeType>): Map<MessageIndex, List<Message>>{


      //how do  I need to process each incoming json messsage and wrap them in IncomingMessage class?
        return incomingMessage.forEach {

                          val eventObj = jacksonObjectMapper().readValue(String(it.data.array()), IncomingMessage::class.java)

        }

That doesn't look like valid JSON to me?

let me clarify.

{"message":"message1", phoneType":"iPhoneX", "test1"}

is one example of a message that will get sent. Since there will a lot of these message there will be a list of them that that will get sent hence they are in a

incomingMessage: List<SomeType>)

. Now it gets a bit tricky to achieve my original goal because I think I need to loop thru each json message first and wrap them to IncomingMessage class

{"message":"message1", phoneType":"iPhoneX", "test1"}

is not valid JSON though.

{"message":"message1", phoneType":"iPhoneX", "someOtherProperty": "test1"}

<----- ah sorry it should be like this so that it can be wrap easily in IncomingMessage class