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For a Spring MVC application, use Spring Boot’s spring-boot-starter-websocket to integrate WebSocket handlers or messaging. For a reactive Spring application, follow Spring Boot’s WebFlux dependency setup. Choose the Jakarta WebSocket API when you want standard endpoint APIs and your server runtime supplies a compatible implementation. In every case, verify the framework, Java, container, and deployment versions you actually run.
What WebSocket support adds to a Java backend
WebSocket is not simply an HTTP request that stays open. The client begins with an HTTP-compatible handshake; after the connection is upgraded, the client and server can exchange messages in both directions over one TCP connection. Spring Framework’s reference describes RFC 6455 as a standardized way to establish “a full-duplex, two-way communication channel between client and server over a single TCP connection.” Spring Framework: WebSockets
This persistent, bidirectional model suits features that need ongoing updates or client messages without a new request for every exchange. The choice of Java integration determines how you define endpoints, connect to the rest of your application, and apply security rules.
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Choose the integration that fits your stack
| Path | Good fit | Check before implementation |
|---|---|---|
| Spring Boot MVC with Spring WebSocket | An application already using Spring MVC that needs framework-integrated handlers or messaging. | Add spring-boot-starter-websocket. Confirm the servlet container and whether deployment is embedded or a standalone WAR. |
| Spring Boot reactive with WebFlux | An application using Spring’s reactive stack that needs WebSocket integration. | Spring Boot documents the WebSocket API alongside spring-boot-starter-webflux. Check the exact Boot version and runtime requirements. |
| Jakarta WebSocket API | An application that wants standard endpoint APIs and runs on a server with a compatible WebSocket implementation. | Confirm the Jakarta platform level and Java baseline. Jakarta WebSocket 2.2 is the Jakarta EE 11 release and lists Java SE 8 or higher as its minimum; the API alone does not supply a server implementation. |
There is no universally best option. Compare your existing application stack (Servlet/MVC or reactive), whether you need raw WebSocket messages or STOMP messaging, container support, Java and Jakarta namespace compatibility, security integration, and proxy or cloud deployment needs. Spring’s messaging-specific security guidance should not be assumed to secure every Jakarta endpoint.
References: Spring Boot: WebSockets and Jakarta WebSocket 2.2.
Set up Spring Boot for the deployment you use
Spring MVC with an embedded server
For Spring Boot MVC, include spring-boot-starter-websocket and configure the Spring WebSocket integration that matches your design, such as handlers or messaging. Spring Boot documents WebSocket auto-configuration for embedded Tomcat and Jetty. Check the documentation for your Boot version rather than assuming that setup details remain unchanged across releases.
Spring MVC deployed as a WAR
With a WAR deployed to a standalone servlet container, Spring Boot assumes the container configures WebSocket support. Verify that the target container and its configuration support the WebSocket implementation required by your application; the embedded-server path is not interchangeable with this deployment model.
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Reactive Spring Boot
WebFlux uses a separate dependency setup: Spring Boot’s reference calls for the WebSocket API alongside spring-boot-starter-webflux. Follow the instructions for the exact Spring Boot version in use, and check compatibility with the server runtime.
Spring Boot’s setup guidance is at the WebSockets reference.
What to verify when using Jakarta WebSocket
Jakarta WebSocket provides server and client endpoint APIs for RFC 6455. Its API version and the implementation available at runtime are separate concerns: adding or compiling against an API does not itself make a server capable of accepting WebSocket connections. Confirm that your application server provides a compatible implementation and that its Jakarta platform level matches the APIs used by your application.
Jakarta WebSocket 2.2 identifies itself as the Jakarta EE 11 release and lists Java SE 8 or higher. Treat those as the specification’s stated baseline, not proof that every server, framework, or deployment combination is compatible. Check the server’s supported platform and your project’s Java version before selecting the API.
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The WebSocket handshake starts over HTTP, but the connection must be upgraded and then passed through as WebSocket traffic. A reverse proxy or fronting web server can prevent the connection from working if it does not forward the upgrade correctly. Spring Framework cautions that configuration depends on the web server; cloud deployments also require checking the provider’s WebSocket guidance.
- Identify every proxy or gateway between the client and application server.
- Check that component’s current documentation for WebSocket upgrade support and required configuration.
- For managed or cloud hosting, confirm the provider’s current WebSocket requirements rather than assuming generic proxy settings apply.
- Test the connection through the deployed route, not only against a local server.
Spring Framework’s deployment discussion is in its WebSockets reference.
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Secure the connection and messages
Spring messaging: carry over identity, then authorize destinations
In Spring’s WebSocket messaging integration, authentication information from the HTTP request that establishes the connection can carry into the WebSocket session. Configure HTTP authentication, then add explicit message-level authorization rules for the application’s destinations. An authenticated handshake does not by itself decide which messages a user may send or receive.
Authorize sends and subscriptions separately
Distinguish a client sending a MESSAGE from subscribing to a destination. For example, a client may be permitted to subscribe to a broadcast destination but not send messages to it; allowing both could let a client impersonate a system notification. Also restrict user-specific subscriptions so one user cannot read another user’s destination.
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Keep the STOMP CSRF behavior
Spring Security requires a valid CSRF token on inbound STOMP CONNECT messages to enforce the same-origin policy. If SockJS requires an adjustment to HTTP-layer CSRF handling, scope any exception to the relevant connection URLs and retain the STOMP token behavior. Do not disable CSRF globally to make a WebSocket connection work.
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Do not assume Jakarta endpoints inherit Spring messaging security
Spring Security states that it does not provide direct JSR-356 security integration because that API does not expose a message interception model. Its messaging authorization guidance applies to Spring’s messaging integration; it does not automatically secure every Jakarta WebSocket endpoint.
See Spring Security: WebSocket Security for the Spring messaging security model.
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