🔌🕸️ JAKARTA EE WEBSOCKET: REAL-TIME SERVER + JAVA CLIENT (NO MAGIC, JUST API)
🔌🕸️ JAKARTA EE WEBSOCKET: REAL-TIME SERVER + JAVA CLIENT (NO MAGIC, JUST API)
🔸 TLDR
▪️ Jakarta WebSocket = standard API (jakarta.websocket) to build real-time apps with annotated server endpoints + Java clients 🚀
🔸 WHY WEBSOCKETS?
▪️ HTTP is request/response ➡️ WebSocket is full-duplex (both sides can push) ⚡
▪️ Great for live dashboards, chat, collaboration, notifications, streaming telemetry 📈
🔸 DEVELOPING AN ANNOTATED WEBSOCKET SERVER ENDPOINT
▪️ The “classic” Jakarta EE style: a POJO + annotations ✅
▪️ You declare the URL with @ServerEndpoint("/ws/chat") and hook lifecycle events.
▪️ Tip: use session.getAsyncRemote() when you don’t want to block IO threads 🧵
▪️ Tip: you can use path params like /ws/chat/{room} to route users to rooms 🏷️
🔸 DEVELOPING WEBSOCKET CLIENTS IN JAVA
▪️ Jakarta WebSocket also provides a client API (yes, not only server) 🧑💻
▪️ You can connect with WebSocketContainer (portable across implementations).
▪️ If you need custom headers, timeouts, subprotocols, or encoders/decoders, use ClientEndpointConfig + message handlers 🎛️
🔸 TYRUS: EXTRA GOODIES (REFERENCE IMPLEMENTATION VIBES)
▪️ Eclipse Tyrus is the well-known implementation around the WebSocket API ecosystem and comes with practical tooling & examples 📚
▪️ Handy topics in the Tyrus guide:
▪️ Deploy endpoints as WAR or via ServerContainer (programmatic deployment) 🧩
▪️ Deep dive into endpoints / sessions / message handlers (great to understand what really happens) 🔍
▪️ Proprietary config (advanced client tuning like masking key generator) ⚙️
🔸 TAKEAWAYS
▪️ Start with @ServerEndpoint + @OnMessage for a clean, readable entry point ✨
▪️ Use AsyncRemote when scaling broadcasts or frequent pushes ⚡
▪️ The client API is first-class: don’t default to JS clients only 🧑💻
▪️ When debugging, think in Session + MessageHandlers + lifecycle (open/message/close/error) 🧠
▪️ Need more than “hello world”? The Tyrus user guide is a goldmine 📘: https://eclipse-ee4j.github.io/tyrus-project.github.io/documentation/latest/index/
#JakartaEE #WebSocket #Java #EclipseTyrus #RealTime #Backend #Microservices #DistributedSystems #APIs #DeveloperTips
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