"spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer",
"spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer",
"spring.kafka.producer.properties.spring.json.type.mapping=userdata:de.juplo.kafka.wordcount.users.TestUserData,ranking:de.juplo.kafka.wordcount.top10.TestRanking",
"spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer",
"spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer",
"spring.kafka.producer.properties.spring.json.type.mapping=userdata:de.juplo.kafka.wordcount.users.TestUserData,ranking:de.juplo.kafka.wordcount.top10.TestRanking",