I know that I need to register classes annotated with @Controller in my servlet context to make my webapp accesible. Usually, I will do it the following way:
@Configuration
@EnableWebMvc
@ComponentScan({"foo.bar.controller"})
public class WebConfig extends WebMvcConfigurerAdapter {
//other stuff like ViewResolvers, MessageResolvers, MessageConverters, etc.
}
All other configuration classes I added to my root application context. Here is how my dispatcher initializer usually look like:
public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class, ServiceConfig.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
But things are getting more interesting when I started to use WebSockets. To get websockets working, you have to put WebSoketConfig.class to servlet context. Here is my example of WebSocketConfig:
@Configuration
@EnableScheduling
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/chat").withSockJS();
}
@Override
public void configureClientInboundChannel(ChannelRegistration channelRegistration) {
channelRegistration.taskExecutor().corePoolSize(4).maxPoolSize(8);
}
@Override
public void configureClientOutboundChannel(ChannelRegistration channelRegistration) {
channelRegistration.taskExecutor().corePoolSize(4).maxPoolSize(8);
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableSimpleBroker("/queue", "/topic");
registry.setApplicationDestinationPrefixes("/app");
}
}
Also, I've created a service to send a message to the topic:
@Service
public class TimeServiceWsImpl implements TimeServiceWs {
@Autowired
private SimpMessagingTemplate messagingTemplate;
@Override
public void sentCurrentTime() {
long currentTime = System.currentTimeMillis();
String destination = "/topic/chatty";
logger.info("sending current time to websocket /topic/time : " + currentTime);
this.messagingTemplate.convertAndSend(destination, currentTime);
}
}
I need to use this service in some other services (Autowire it). And now I'm in a deadlock:
- If I'm trying to create
TimeServiceWsbean inside root application context, as expected it doesn't seeSimpMessagingTemplatebean and throwsNoSuchBeanDefinitionException - If I'm trying to create
TimeServiceWsbean inside servlet context, then I'm unable to autowire it to any another service, because root context can't see servlet context beans(as far as I know) - If I move all my configurations to servlet context, all beans are successfully created, but I get the following exception:
java.lang.IllegalStateException: No WebApplicationContext foundand can't access my webapp
What am I supposed to do? What should be inside root context? What should be inside servlet context? And could you please clarify the difference between these context one more time please?
If you will need any additional information, just let me know.
