CODEWITHSUNDEEP
tomcatjsf-2jsf-2.3
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Reputation: 2041

JSF 2.3 fails to support WebSocket with Tomcat 9

I tried to test new WebSocket feature with JSF 2.3.3(Glassfish implementation). I used Tomcat 9.0.1 as web server and followed this guide(https://javaserverfaces.github.io/whats-new-in-jsf23.html)

I created a managed bean:

@Named
@ApplicationScoped
public class Controller {

    @Inject @Push
    private PushContext cityChannel;

    public void send() {
        cityChannel.send("test");
    }
}

updated index.xhtml:

<f:websocket channel="cityChannel"
            onmessage="function(message){alert(message)}" />

And updated web.xml:

<context-param>
    <param-name>javax.faces.ENABLE_CDI_RESOLVER_CHAIN</param-name>
    <param-value>true</param-value>
</context-param>
<context-param>
    <param-name>javax.faces.ENABLE_WEBSOCKET_ENDPOINT</param-name>
    <param-value>true</param-value>
</context-param>

Unfortunately Tomcat failed to load application with an error:

SEVERE [main] com.sun.faces.config.ConfigureListener.contextInitialized Critical error during deployment:
 javax.websocket.DeploymentException: Multiple Endpoints may not be deployed to the same path [/javax.faces.push/{channel}] : existing endpoint was [class com.sun.faces.push.WebsocketEndpoint] and new endpoint is [class com.sun.faces.push.WebsocketEndpoint]
        at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:169)

If I remove context param javax.faces.ENABLE_WEBSOCKET_ENDPOINT then JSF runtime raises an error when I hit index.xhtml:

Caused by: java.lang.IllegalStateException: f:websocket endpoint is not enabled. You need to set web.xml context param 'javax.faces.ENABLE_WEBSOCKET_ENDPOINT' with value 'true'.

Please, advise.

Upvotes: 3

Views: 1920

Answers (1)

BalusC
BalusC

Reputation: 1108852

javax.websocket.DeploymentException: Multiple Endpoints may not be deployed to the same path [/javax.faces.push/{channel}] : existing endpoint was [class com.sun.faces.push.WebsocketEndpoint] and new endpoint is [class com.sun.faces.push.WebsocketEndpoint] at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:169) I

This will happen when the runtime classpath is polluted with multiple Mojarra implementations. For example, one coming from a jsf-impl.jar file and another coming from a javax.faces.jar file. Or perhaps even multiple different versioned one.

You need to ensure that you have only one version of a library in the runtime classpath. This does not apply specifically to Mojarra, but to every Java based library.

Installation instructions of Mojarra can be found in its README.

Upvotes: 2

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