When using WebSocket @service annotation service classes start no problem, when sending a chat message, unusual: java.lang.NullPointException, the process to find a lot of solutions, but these methods are not resolved, there will be other some mistakes.
Finally resolved, Citie recorded for later inspection.
The first embodiment: the configurator = SpringConfigurator.class add annotations later @ServerEndpoint
as follows
@ServerEndpoint(value = "/websocket/{user}", configurator = SpringConfigurator.class)
@Controller
The following error occurs in this way, from the literal meaning is ContextLoaderListener not running.
java.lang.IllegalStateException: Failed to find the root WebApplicationContext. Was ContextLoaderListener not used?
ContextLoaderListener is spring MVC web.xml configuration file, with Spring boot relationship does not seem, there is no depth in a different way.
The second way: configure websock class configuration class in websock
as follows:
@Configuration
public class EndpointConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
ServerEndpointExporter serverEndpointExporter = new ServerEndpointExporter();
serverEndpointExporter.setAnnotatedEndpointClasses(WebsocketController.class);
return serverEndpointExporter;
}
}
WebsocketController websocket implementation class is still unresolved.
The third way: Class rewrite ApplicationContextAware
as follows:
@Component
public class SpringUtil implements ApplicationContextAware {
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
if(SpringUtil .applicationContext == null) {
SpringUtil .applicationContext = applicationContext;
}
}
public static ApplicationContext getApplicationContext(){
return applicationContext;
}
public static Object getBean(String beanName){
return applicationContext.getBean(beanName);
}
public static <T> T getBean(Class<T> clazz){
return (T)applicationContext.getBean(clazz);
}
}
Then, to obtain Service methods getBean
private static WeChatService weChatService = SpringUtil .getBean(WeChatService.class);
This method seems very feasible ah, start, error ...
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'websocketController' defined in file
bean creation fails, is preparing to overcome this problem, accidentally we found another solution.
The fourth way: Service class initialization, and then assigned by @Autowired
as follows:
private static WeChatService weChatService ;
@Autowired
public void setWeChatService(WeChatService weChatService){
this.weChatService = weChatService;
}
So far the problem is solved.
But the third way in the end may not be feasible, the message needs to be big brothers! ! !
end!
