Problem decoding union of INT or STRING : Failed to validate JSON to Avro

[alibenmessaoud]

I have a problem to validate JSON from Kafka:

We receive data as an example as follows:

"slotid": {
  "string": "xyz"
}

The validation shows this error:

org.opentest4j.AssertionFailedError: Unexpected exception thrown: tech.allegro.schema.json2avro.converter.AvroConversionException: Failed to convert JSON to Avro: Could not evaluate union, field slotid is expected to be one of these: NULL, STRING. If this is a complex type, check if offending field: slot.slotid adheres to schema.

But it works for an input as follows :

"slotid": "xyz" 

In the schema, we have:

"name" : "slotid",
"type" : [ "null", "string" ],
"default" : null

The same thing for other types like INT, MAP, etc.:

"source": {
  "map": {
    "originCreationTime": "xxx",
    "originId": "yyy"
  }
}