WebSockets JSR 356 Spring integration #ServerEndpoint - spring

Question

Problem: #Autowired beans in #ServerEndpoint class are null
How can I make sure that this WebSocketController class below will be injected with beans, that is how can I make it managed by Spring? I can connect to the websocket so it works but gameService is always null inside the WebSocketController class instance, so I think that it is created by tomcat somehow and not Spring.
I'm using Spring boot. I just need to figure out how to inject beans into this websocket controller class.
WebSocketController class
#Component
#ServerEndpoint("/sock")
public class WebSocketController {
#Autowired
private GameService gameService;
private static Set<Session> clients = Collections.synchronizedSet(new HashSet<Session>());
#OnMessage
public void handleMessage(Session session, String message) throws IOException {
session.getBasicRemote().sendText(
"Reversed: " + new StringBuilder(message).reverse());
}
#OnOpen
public void onOpen(Session session) {
clients.add(session);
System.out.println("New client #"+session.getId());
if (gameService == null) System.out.println("game service null");
}
#OnClose
public void onClose(Session session) {
clients.remove(session);
System.out.println("Client disconnected #" + session.getId());
}
}
GameService interface and implementation
public interface GameService {
List<Character> getCharacters();
}
#Service
public class GameServiceMockImpl implements GameService {
#Override
public List<Character> getCharacters() {
List<Character> list = new ArrayList<>();
list.add(new Character("aaa","1.png",100));
list.add(new Character("aaa","2.jpg",100));
list.add(new Character("aaa","3.jpg",100));
return list;
}
}
Application class
#SpringBootApplication
public class App {
public static void main(String args[]){
SpringApplication.run(App.class,args);
}
#Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
EDIT:
Using Spring 4 WebSockets doesn't work at all, I can't even connect via a browser.
#Configuration
#EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
#Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(myHandler(), "/myHandler");
}
#Bean
public WebSocketHandler myHandler() {
return new MyHandler();
}
}
public class MyHandler extends TextWebSocketHandler {
#Override
public void handleTextMessage(WebSocketSession session, TextMessage message) {
System.out.println(message.getPayload());
}
}

Answer 1

You are trying to integrate Spring and Java WebSocket API. A class annotated by #Component is registered to a spring bean and its instance is managed by spring but if a class is annotated by #ServerEndpoint it is registered to a server-side WebSocket endpoint and every time the corresponding endpoint's WebSocket is connected to the server, its instance is created and managed by JWA implementation. We you can't use both annotations together.
Either you can use CDI injection(your server should also support)
#ServerEndpoint("/sock")
public class WebSocketController {
#Inject
private GameService gameService;
Or have a look on this doc, Spring 4 has support for WebSocket

Answer 2

Maybe this article can help:
https://spring.io/blog/2013/05/23/spring-framework-4-0-m1-websocket-support
You can use dependency (with spring version > 4)
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-websocket</artifactId>
<version>${spring.version}</version>
</dependency>
And then simply
#ServerEndpoint(value = "/echo", configurator = SpringConfigurator.class)
public class WebSocketEndpoint {
#Inject
private BroadcastService broadcaster;