Could not autowire. No beans of SimpMessagingTemplate type found

Question

I am configuring Websockets in Spring basically by following the guide provided in the documentation.

I am currently trying to send a message from the server to the client as explained in the section "Sending messages from anywhere"

Following the example, you can Autowire a class called SimpMessagingTemplate

@Controller
public class GreetingController {

    private SimpMessagingTemplate template;

    @Autowired
    public GreetingController(SimpMessagingTemplate template) {
        this.template = template;
    }

    @RequestMapping(value="/greetings", method=POST)
    public void greet(String greeting) {
        String text = "[" + getTimestamp() + "]:" + greeting;
        this.template.convertAndSend("/topic/greetings", text);
    }

}

However, my current project cannot find the bean "SimpMessagingTemplate". (Intellij: 'Could not autowire. No beans of SimpMessagingTemplate type found'.

I have check several examples in the internet but I cannot find how to get Spring to create an instance of SimpMessagingTemplate. How can I Autowire it ?

EDIT:

I decided to send some more background information. This is my current websocket configuration:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:websocket="http://www.springframework.org/schema/websocket"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/websocket
        http://www.springframework.org/schema/websocket/spring-websocket-4.0.xsd">

        <!-- TODO properties to be read from a properties file -->
        <websocket:message-broker application-destination-prefix="/app">
            <websocket:stomp-endpoint path="/new_session" >
                <websocket:sockjs/>
            </websocket:stomp-endpoint>
            <websocket:simple-broker prefix="/topic"/>
        </websocket:message-broker>
</beans>

Websocket works with this controller

@Controller
public class SessionController {

    private static final Logger log = LoggerFactory.getLogger(SessionController.class);

    @MessageMapping("/new_session")
    @SendTo("/topic/session")
    public SessionStatus newSession(Session session) throws Exception {
    Thread.sleep(3000); // simulated delay
    log.info("Response sent !!");
    return new SessionStatus("StatusReport, " + session.toString() + "!");
    }
}

I just not sure how to to make this work

public class SessionController {

    private static final Logger log = LoggerFactory.getLogger(SessionController.class);

    private SimpMessagingTemplate template;

    @Autowired
    public SessionController(SimpMessagingTemplate template) {
    this.template = template;
    }

}

As the bean "SimpMessagingTemplate template" is not found. Spring documentation does not offer more details regarding this matter.

EDIT: Example of working code in github

Answer 1

I had the same problem, the error occurred because my websocket config file:

@Configuration
@EnableWebSocketMessageBroker
@EnableScheduling
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

}

was not scanned by spring.

so the fix was to add the package with this configuration file to the scanned packages.