How to sent a real null in a kafka message?

[poorSock]

Hi,
another question from me, maybe someone has a quick hint, what I am doing wrong.

I try to send a real null value in a kafka message (not a "null" String).
In our schema the field is defined as follows:
{ "name" : "idReferenceType", "type" : [ "null", "string" ], "default" : null }

According to the docs sending null should work for this type of field.

When trying to sent an event I only manage to get a "null" String in my kafka message, not a real null value.

I've tried:

But all of these only lead to a "null" string or empty "" string instead of a real null value.

How to sent a real null?

tested with V 5.3.1 & V5.3.3

[marioTemprano]

Hi @poorSock, if you remove the "idReferenceType" line, it will send a real null value

[poorSock]

Hi,
thanks, that does it. I just wonder, what is the use of the "null" type then?

[marioTemprano]

@poorSock, the "null" type is mainly for union definition