Spring websocket receiving 404 not found

Question

I am trying to create a websocket endpoint using spring. But whenever I try to connect from the end of the client, I get 404. I also have a Java implementation with

@ServerEndpoint(value = "/websocket") 

which works well. Below is the code of my spring implementation, which is not working. What am I doing wrong here?

 package com.tlab.endpoint; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.config.annotation.EnableWebSocket; import org.springframework.web.socket.config.annotation.WebSocketConfigurer; import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry; @Configuration @EnableWebSocket public class WebSocketConfig implements WebSocketConfigurer { @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(socketHandler(),"/socket");; } @Bean public WebSocketHandler socketHandler() { return new SocketHandler(); } } 

below is the handler

 package com.tlab.endpoint; import org.springframework.web.socket.TextMessage; import org.springframework.web.socket.WebSocketSession; import org.springframework.web.socket.handler.TextWebSocketHandler; public class SocketHandler extends TextWebSocketHandler { @Override public void handleTextMessage(WebSocketSession session, TextMessage message) { } } 

In client side code, I tried all possible combinations

c / socket in the handler

 var websocket = new WebSocket("ws://localhost:8080/tsim/socket"); var websocket = new WebSocket("ws://localhost:8080/tsim/socket"); var websocket = new WebSocket("ws://localhost:8080/tsim/rest/socket"); 

c / rest / socket in the handler

 var websocket = new WebSocket("ws://localhost:8080/tsim/rest/socket"); 

where tsim is my context root. Everything gives the following error

 WebSocket connection to 'ws://localhost:8080/tsim/socket' failed: Error during WebSocket handshake: Unexpected response code: 404. 

I did not have compilation and deployment errors. I used tomcat 8.0 and below servlet manager configuration.

 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:int="http://www.springframework.org/schema/integration" xmlns:int-ftp="http://www.springframework.org/schema/integration/ftp" xmlns:batch="http://www.springframework.org/schema/batch" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.2.xsd http://www.springframework.org/schema/integration/ftp http://www.springframework.org/schema/integration/ftp/spring-integration-ftp.xsd http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd" > <import resource="classpath*:web-db-spring.xml"/> <context:component-scan base-package="com.traderslab.nseb,com.tlab.endpoint"/> <aop:aspectj-autoproxy/> <mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="prefixJson" value="false"/> <property name="supportedMediaTypes" value="application/json"/> <property name="objectMapper"> <bean class="com.fasterxml.jackson.databind.ObjectMapper"> <property name="serializationInclusion" value="NON_NULL"/> </bean> </property> </bean> <bean class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter"/> </mvc:message-converters> </mvc:annotation-driven> <mvc:default-servlet-handler/> </beans> 

below is my web.xml

 <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/dispatcher-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/rest/</url-pattern> </servlet-mapping> 

Answer 1

I finally found the answer. Because this is handled by the dispatcher servlet as a regular HTTP request. I need to add @Controller annotation to WebSocketConfig class

 @Configuration @EnableWebSocket @Controller public class WebSocketConfig implements WebSocketConfigurer 

Answer 2

In my case, the problem was matching dispatcher servlets. I only had a * .mvc mapping, and websocket without it, so I had to change to:

  <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.mvc</url-pattern> <url-pattern>/</url-pattern> </servlet-mapping>