jakarta.websocket.server

Annotation Type ServerEndpoint

@Retention(value=RUNTIME)
 @Target(value=TYPE)
public @interface ServerEndpoint

This class level annotation declares that the class it decorates is a web socket endpoint that will be deployed and made available in the URI-space of a web socket server. The annotation allows the developer to define the URL (or URI template) which this endpoint will be published, and other important properties of the endpoint to the websocket runtime, such as the encoders it uses to send messages.

The annotated class must have a public no-arg constructor.

For example:

 
 @ServerEndpoint("/hello");
 public class HelloServer {

     @OnMessage
     public void processGreeting(String message, Session session) {
         System.out.println("Greeting received:" + message);
     }

 }
 
 

Author:

dannycoward

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	value The URI or URI-template, level-1 (See RFC 6570) where the endpoint will be deployed.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
Class<? extends ServerEndpointConfig.Configurator>	configurator The optional custom configurator class that the developer would like to use to further configure new instances of this endpoint.
Class<? extends Decoder>[]	decoders The ordered array of decoder classes this endpoint will use.
Class<? extends Encoder>[]	encoders The ordered array of encoder classes this endpoint will use.
String[]	subprotocols The ordered array of web socket protocols this endpoint supports.

Element Detail

value

public abstract String value

The URI or URI-template, level-1 (See RFC 6570) where the endpoint will be deployed. The URI us relative to the root of the web socket container and must begin with a leading "/". Trailing "/"'s are ignored. Examples:

 
 @ServerEndpoint("/chat")
 @ServerEndpoint("/chat/{user}")
 @ServerEndpoint("/booking/{privilege-level}")
 
 

Returns:

the URI or URI-template

subprotocols

public abstract String[] subprotocols

The ordered array of web socket protocols this endpoint supports. For example, {"superchat", "chat"}.

Returns:

the subprotocols.

Default:

{}

decoders

public abstract Class<? extends Decoder>[] decoders

The ordered array of decoder classes this endpoint will use. For example, if the developer has provided a MysteryObject decoder, this endpoint will be able to receive MysteryObjects as web socket messages. The websocket runtime will use the first decoder in the list able to decode a message, ignoring the remaining decoders.

Returns:

the decoders.

Default:

{}

encoders

public abstract Class<? extends Encoder>[] encoders

The ordered array of encoder classes this endpoint will use. For example, if the developer has provided a MysteryObject encoder, this class will be able to send web socket messages in the form of MysteryObjects. The websocket runtime will use the first encoder in the list able to encode a message, ignoring the remaining encoders.

Returns:

the encoders.

Default:

{}

configurator

public abstract Class<? extends ServerEndpointConfig.Configurator> configurator

The optional custom configurator class that the developer would like to use to further configure new instances of this endpoint. If no configurator class is provided, the implementation uses its own. The implementation creates a new instance of the configurator per logical endpoint.

Returns:

the custom configuration class, or ServerEndpointConfig.Configurator.class if none was set in the annotation.

Default:

jakarta.websocket.server.ServerEndpointConfig.Configurator.class