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asmhatreandClaude Sonnet 5 c1b40b0db9 Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z

2026-09-28 09:19:55 +00:00

legacy

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

migrated

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

output

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

scripts

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

.gitignore

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

README.md

Add kafka4-migration module: Spring Kafka 3.3 to 4.1 migration on Boot 3.5 to 4.1

2026-09-28 09:19:55 +00:00

README.md

kafka4-migration: Spring Kafka 3 to 4 on Spring Boot 3.5 to 4.1

Companion code for the ankurm.com post "Spring Kafka 3 to 4 Migration Guide".

Folder	What it is
`legacy/`	Producer, `@KafkaListener` and an `@EmbeddedKafka` test on Boot 3.5.16 / Spring Kafka 3.3.16 / kafka-clients 3.9.2 (JDK 21), using the Jackson 2 `JsonSerializer`
`migrated/`	The same app on Boot 4.1.1 / Spring Kafka 4.1.1 / kafka-clients 4.2.1 (JDK 25), using `spring-boot-starter-kafka` and `JacksonJsonSerializer`
`scripts/run-all.sh`	Builds the intermediate stages from `legacy/` and regenerates every file in `output/`
`output/`	Transcripts for each stage

Spring Kafka 4.1.1 is the latest GA; 4.2.0-M1 and 4.2.0-M2 are milestones and are not tested here. No external broker is needed: the tests use @EmbeddedKafka. Tested on 28 September 2026.