Jetty fails to start with ClassNotFoundException: org.eclipse.jetty.client.HttpClient - websocket

Question

I'm trying to create a war file containing single WebSocket servlet. For some reason jetty wants HttpClient, even though I'd like to have only server side logic. HttpClient is there in the "jetty-client-9.4.0.v20161208.jar" file under Jetty. But that's not listed in the status dump (jetty.server.dumpAfterStart=true).
web.xml
<web-app>
<display-name>WebSocketApp</display-name>
<servlet>
<servlet-name>wsservlet</servlet-name>
<servlet-class>com.example.test.MyJettyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>wsservlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
Socket:
#ServerEndpoint("/control")
public class ControlSocket {
#OnOpen
public void onOpen(Session session) {
System.out.println("WebSocket opened: " + session.getId());
}
#OnMessage
public void onMessage(String txt, Session session) throws IOException {
System.out.println("Message received: " + txt);
session.getBasicRemote().sendText(txt.toUpperCase());
}
#OnClose
public void onClose(CloseReason reason, Session session) {
System.out.println("Closing a WebSocket due to " + reason.getReasonPhrase());
}
}
Gradle build file:
dependencies {
compile 'org.projectlombok:lombok:1.16.2'
compile group: 'javax.websocket', name: 'javax.websocket-api', version: '1.1'
compile group: 'org.yaml', name: 'snakeyaml', version: '1.16'
compile group: 'org.slf4j', name: 'slf4j-log4j12', version: '1.7.21'
compile group: 'commons-lang', name: 'commons-lang', version: '2.6'
testCompile 'junit:junit:4.11'
}
I'd assume something wrong with dependencies. But what exactly? Should I include websocket implementation jars? If yes, then why?

Answer 1

If you using jetty-distribution, add the client module.
$ cd /path/to/mybase
$ java -jar /path/to/jetty-dist/start.jar --add-to-start=client
This is being improved in Jetty 9.4.1 btw.