Atmosphere Documentation

Atmosphere is a transport-agnostic real-time framework for the JVM. Write to a Broadcaster, and the framework delivers to every subscriber -- whether they're on a WebSocket, SSE stream, long-polling loop, gRPC channel, or MCP session.

• What's New in 4.0

Core

• Core Runtime -- Broadcaster, AtmosphereResource, @ManagedService, transport negotiation
• Rooms & Presence -- Room management, join/leave, presence tracking, message history, AI virtual members

Framework Integration

• Spring Boot -- Auto-configuration for Spring Boot 4.0+, gRPC transport, native image
• Quarkus -- Build-time processing for Quarkus 3.21+, native image

AI / LLM

• AI Core -- AiSupport SPI, @AiEndpoint, filters, routing, conversation memory
• Spring AI Adapter -- AiSupport backed by Spring AI ChatClient
• LangChain4j Adapter -- AiSupport backed by LangChain4j StreamingChatLanguageModel
• Google ADK Adapter -- AiSupport backed by Google ADK Runner
• Embabel Adapter -- AiSupport backed by Embabel AgentPlatform

Protocols

• gRPC Transport -- Bidirectional streaming via grpc-java
• MCP Server -- Model Context Protocol server over WebSocket, SSE, or Streamable HTTP

Client Libraries

• atmosphere.js (TypeScript) -- Browser client with React, Vue, and Svelte hooks
• wAsync (Java) -- Async Java client for WebSocket, SSE, streaming, long-polling, gRPC

Infrastructure

• Redis Clustering -- Cross-node broadcasting via Redis pub/sub
• Kafka Clustering -- Cross-node broadcasting via Kafka
• Durable Sessions -- Session persistence across restarts (InMemory, SQLite, Redis)

Extensions

• Kotlin DSL -- Builder API and coroutine extensions
• Observability -- Micrometer metrics, OpenTelemetry tracing, backpressure

Additional Resources

• Samples -- Runnable apps covering every transport and integration
• Javadoc
• GitHub