Runtime constraints

The project-owned limitations listed for 1.4.2 have been resolved. The remaining constraints come from the runtime or the services the library interoperates with.

Kafka Streams broker support

group.protocol=streams requires a broker with the streams rebalance protocol enabled and streams.version=1 finalized. Use group.protocol=classic with an older broker. KrabkaStreamsConfig.withDefaults preserves either explicit choice.

State stores, punctuators, interactive queries, and processing guarantees are Apache Kafka Streams APIs and retain the behavior of the Kafka version exported by this library.

Java and Arrow

Java 17 is the minimum supported runtime. Published classes target --release 17. Artifacts carry stable Automatic-Module-Name entries for JPMS consumers.

Arrow 19 needs this runtime option when it accesses direct buffers:

--add-opens=java.base/java.nio=ALL-UNNAMED

Packaging

The io.krabka:krabka-streams-bom platform pins every module to one release. Each module also publishes an all classifier containing its runtime dependencies. Use the ordinary artifact when your dependency manager already controls those libraries; use the shaded artifact only for a standalone classpath.

The all artifacts do not relocate third-party package names. Relocation would break service loading, generated Avro and Protobuf types, and Arrow’s reflective access, so dependency-managed ordinary artifacts remain the default.