$ mvn test   # Boot 3.5.16, JDK 21
RESULT key=k1 id=o-1 qty=3
BROKERS 127.0.0.1:PORT
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 7.853 s -- in com.ankurm.kafka.OrderFlowTest
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[INFO] BUILD SUCCESS

org.apache.kafka:kafka-clients:jar:3.9.2:compile
org.springframework.kafka:spring-kafka:jar:3.3.16:compile

$ java -cp target/classes:<runtime classpath> SerdeProbe
SERIALIZED {"id":"o-1","qty":3}