Spring Websocket: Error during WebSocket handshake: Unexpected response code: 404 - spring-websocket

Question

I implemented my own Websocket application based on Spring framework and used the same configuration: http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html
Server side code:
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
#Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/ws").withSockJS();
}
}
client side code: *.jsp file
/*
*connect to websocket
*/
function connect() {
var socket = new SockJS("<c:url value='/ws'/>");
stompClient = Stomp.over(socket);
stompClient.connect();
}
function disconnect() {
stompClient.disconnect();
setConnected(false);
console.log("Disconnected");
}
pom.xml dependencies:
<!-- Spring websocket and messaging -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-messaging</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-websocket</artifactId>
<version>${org.springframework.version}</version>
</dependency>
The application can run on Spring Tools Suite's Pivotal tc Server Developer Edition v3.0 (blinding with Tomcat8.0.15) or Tomcat7.0.53. However, when I deploy this application to server, the websocket is not working. The console shows:
stomp.min.js:8 Opening Web Socket...
sockjs.min.js:27 WebSocket connection to 'ws://serverip/ws/331/xsooi48g/websocket' failed: Error during WebSocket handshake: Unexpected response code: 404
sockjs.min.js:27 POST http://serverip/ws/331/1mg08452/xhr_streaming 500 (Internal Server Error)
sockjs.min.js:27 POST http://serverip/ws/331/mmodvswk/xhr 500 (Internal Server Error)
stomp.min.js:8 Whoops! Lost connection to undefined
Did I miss something else?
UPDATE:
Tomcat version 7.0.52.0
Server side log:
WARN : org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsService - Failed to create a default WebSocketTransportHandler
java.lang.IllegalStateException: No suitable default RequestUpgradeStrategy found
at org.springframework.web.socket.server.support.DefaultHandshakeHandler.initRequestUpgradeStrategy(DefaultHandshakeHandler.java:127)
at org.springframework.web.socket.server.support.DefaultHandshakeHandler.<init>(DefaultHandshakeHandler.java:96)
at org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsService.getDefaultTransportHandlers(DefaultSockJsService.java:88)
at org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsService.<init>(DefaultSockJsService.java:74)
at org.springframework.web.socket.config.annotation.SockJsServiceRegistration.createSockJsService(SockJsServiceRegistration.java:286)
at org.springframework.web.socket.config.annotation.SockJsServiceRegistration.getSockJsService(SockJsServiceRegistration.java:244)
at org.springframework.web.socket.config.annotation.WebMvcStompWebSocketEndpointRegistration$StompSockJsServiceRegistration.getSockJsService(WebMvcStompWebSocketEndpointRegistration.java:161)
at org.springframework.web.socket.config.annotation.WebMvcStompWebSocketEndpointRegistration.getMappings(WebMvcStompWebSocketEndpointRegistration.java:127)
at org.springframework.web.socket.config.annotation.WebMvcStompEndpointRegistry.getHandlerMapping(WebMvcStompEndpointRegistry.java:142)
at org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurationSupport.stompWebSocketHandlerMapping(WebSocketMessageBrokerConfigurationSupport.java:59)
at org.springframework.web.socket.config.annotation.DelegatingWebSocketMessageBrokerConfiguration$$EnhancerBySpringCGLIB$$4b464c58.CGLIB$stompWebSocketHandlerMapping$9(<generated>)
at org.springframework.web.socket.config.annotation.DelegatingWebSocketMessageBrokerConfiguration$$EnhancerBySpringCGLIB$$4b464c58$$FastClassBySpringCGLIB$$59d52b8d.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:309)
at org.springframework.web.socket.config.annotation.DelegatingWebSocketMessageBrokerConfiguration$$EnhancerBySpringCGLIB$$4b464c58.stompWebSocketHandlerMapping(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:591)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1111)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1006)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1229)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1875)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
INFO : org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/ws/**] onto handler of type [class org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler]
INFO : org.springframework.context.support.DefaultLifecycleProcessor - Starting beans in phase 2147483647

Answer 1

After a week trying to solve the same error with no solution on the net, I manage to solve it.
Firstly, change this:
registry.addEndpoint("/ws").withSockJS();
to this :
registry.addEndpoint("/ws")
.setHandshakeHandler(new DefaultHandshakeHandler(new TomcatRequestUpgradeStrategy()))
.withSockJS();
This makes Tomcat accept websocket protocols as it could upgrade the HTTP protocol.
Maybe you are using Apache as I do, so you need to enable proxy and wstunnel modules, so you should run this commands on terminal:
$ sudo a2enmod proxy
$ sudo service apache2 restart
$ sudo a2enmod proxy_wstunnel
$ sudo service apache2 restart
You should upgrade your tomcat too