How to Set Up WebSocket Support in Dropwizard 4 with Jetty 11?

Question

I'm currently working on a Dropwizard 4 project with Jetty 11, and I'm having trouble setting up WebSocket support. Previous recommendations recommend using https://github.com/LivePersonInc/dropwizard-websockets but that seems to be outdated. All recommendations that I have found use a class JettyWebSocketServletContainerInitializer which I can't find in any of the dependencies that I have. I am using dropwizard guicy, but I don't think that has any effect here.

Current Dependencies:

<dependency> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-server</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-servlet</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jakarta-server</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jetty-server</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jetty-api</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jakarta-common</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-core-server</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-core-common</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jetty-client</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-jetty-common</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-servlet</artifactId> </dependency> <dependency> <groupId>org.eclipse.jetty.websocket</groupId> <artifactId>websocket-server</artifactId> <version>9.4.56.v20240826</version> </dependency> <dependency> <groupId>jakarta.websocket</groupId> <artifactId>jakarta.websocket-api</artifactId> <version>2.1.1</version> </dependency>

All the ones without versions are using the 11.0.20. I realise I don't need all these dependencies, if you could let me know what I am missing and which ones I need that would be great. I've tried various versions to try and get it to work but I'm clearly missing something.

A small code snippet of the setup in the application would be really helpful.

Mark · Accepted Answer · 2024-12-13 01:17:09Z

This project helped me out: https://github.com/TomCools/dropwizard-websocket-jsr356-bundle.

If you are using Guice for DI, you'll want to add a Configurator:

 ServerEndpointConfig serverEndpointConfig = ServerEndpointConfig.Builder.create(MyWebsocketServer.class, "/my-ws-enpoint") .configurator(new GuiceConfigurator()) .build(); class GuiceConfigurator extends ServerEndpointConfig.Configurator { @Override public <T> T getEndpointInstance(Class<T> endpointClass) throws InstantiationException { return injector.getInstance(endpointClass); } }

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