Produce Avro messages in Confluent Control Center UI - apache-kafka

Question

To develop a data transfer application I need first define a key/value avro schemas. The producer application is not developed yet till define the avro schema.
I cloned a topic and its key/value avro schemas that are already working and
and also cloned the the jdbc snink connector. Simply I just changed the topic and connector names.
Then I copied and existing message successfully sent sink using Confluent Topic Message UI Producer.
But it is sending the error: "Unknown magic byte!"
Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!
at io.confluent.kafka.serializers.AbstractKafkaSchemaSerDe.getByteBuffer(AbstractKafkaSchemaSerDe.java:250)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer$DeserializationContext.<init>(AbstractKafkaAvroDeserializer.java:323)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer.deserializeWithSchemaAndVersion(AbstractKafkaAvroDeserializer.java:164)
at io.confluent.connect.avro.AvroConverter$Deserializer.deserialize(AvroConverter.java:172)
at io.confluent.connect.avro.AvroConverter.toConnectData(AvroConverter.java:107)
... 17 more
[2022-07-25 03:45:42,385] INFO Stopping task (io.confluent.connect.jdbc.sink.JdbcSinkTask)
Reading other questions it seems the message has to be serialized using the schema.
Unknown magic byte with kafka-avro-console-consumer
is it possible to send a message to a topic with AVRO key/value schemas using the Confluent Topic UI?
Any idea if the avro schemas need information depending on the connector/source? or if namespace depends on the topic name?
This is my key schema. And the topic's name is knov_03
{
"connect.name": "dbserv1.MY_DB_SCHEMA.ps_sap_incoming.Key",
"fields": [
{
"name": "id_sap_incoming",
"type": "long"
}
],
"name": "Key",
"namespace": "dbserv1.MY_DB_SCHEMA.ps_sap_incoming",
"type": "record"
}
Connector:
{
"name": "knov_05",
"config": {
"connector.class": "io.confluent.connect.jdbc.JdbcSinkConnector",
"tasks.max": "1",
"key.converter": "io.confluent.connect.avro.AvroConverter",
"value.converter": "io.confluent.connect.avro.AvroConverter",
"topics": "knov_03",
"connection.url": "jdbc:mysql://eXXXXX:3306/MY_DB_SCHEMA?useSSL=FALSE&nullCatalogMeansCurrent=true",
"connection.user": "USER",
"connection.password": "PASSWORD",
"insert.mode": "upsert",
"delete.enabled": "true",
"pk.mode": "record_key",
"pk.fields": "id_sap_incoming",
"auto.create": "true",
"auto.evolve": "true",
"value.converter.schema.registry.url": "http://schema-registry:8081",
"key.converter.schema.registry.url": "http://schema-registry:8081"
}
}
Thanks.