Backend protocols in Java

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• -rw-r--r-- Backend protocols in Java — the map Concept 2026-08-09

  How the main service protocols — REST, GraphQL, gRPC, WebSockets/SSE, messaging — map onto Jakarta, Spring, Quarkus and Micronaut.

• -rw-r--r-- API documentation in Java Concept 2026-08-09

  OpenAPI, AsyncAPI, protobuf and GraphQL SDL tooling across Spring, Quarkus and Micronaut — springdoc, SmallRye/Micronaut OpenAPI, Springwolf, OpenAPI Generator — and which direction each stack favors.

• -rw-r--r-- GraphQL on the JVM Concept 2026-08-09

  graphql-java as the shared engine beneath Spring for GraphQL, SmallRye GraphQL, Micronaut GraphQL and Netflix DGS, plus N+1 and subscriptions.

• -rw-r--r-- gRPC in Java Concept 2026-08-09

  Protobuf contracts, grpc-java, streaming modes and deadlines, with the Spring, Quarkus and Micronaut integrations and when to prefer gRPC over REST.

• -rw-r--r-- Messaging in Java — Kafka, JMS & AMQP Concept 2026-08-09

  Kafka clients and their Spring, Quarkus and Micronaut integrations, JMS and AMQP alternatives, delivery semantics, Avro serialization and broker testing.

• -rw-r--r-- REST & HTTP APIs in Java Concept 2026-08-09

  Jakarta REST (JAX-RS) and its framework equivalents — Spring MVC/WebFlux, Quarkus REST, Micronaut HTTP — plus clients, OpenAPI and error conventions.

• -rw-r--r-- WebSockets & SSE in Java Concept 2026-08-09

  Jakarta WebSocket, Spring's STOMP layer, Quarkus WebSockets Next and Micronaut WebSocket, with SSE as the cheaper one-way option and fan-out scaling.