[JAVA] Spring Boot application built-in Tomcat, Apache and WebSocket integration

About Spring Boot applications

When creating a web application with SpringBoot, it is possible to start it by executing the artifact of the Jar file using the built-in Tomcat.

java -jar xxx.jar

However, since it is different from the conventional deployment with War file, I was addicted to the setting of cooperation with the built-in Tomcat + Apache + WebSocket.

Ajp settings

Add JavaConfig for embedded tomcat

The following JavaConfig will be the same as the traditional server.xml settings.

TomcatConfiguration.java

@Configuration
public class TomcatConfiguration 
{

 
    @Bean
    public EmbeddedServletContainerFactory servletContainer() {
　　　　　　　　　　　　　　　　TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();
        tomcat.addAdditionalTomcatConnectors(ajpConnector());
        return tomcat;
    }

    private Connector ajpConnector() {
        Connector connector = new Connector("org.apache.coyote.ajp.AjpNioProtocol");
        connector.setAttribute("maxThreads", 100);
        connector.setProtocol("AJP/1.3");
        connector.setPort(8009);
        connector.setRedirectPort(8043);
        connector.setURIEncoding("UTF-8");
        return connector;
    }

}

server.xml

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

Enable WebSocket

1. Add dependency

Add to gradle dependency

build.gradle

dependencies {
...
    compile "org.springframework.boot:spring-boot-starter-websocket:1.3.3.RELEASE"
...
}

2. Enable Websocket

Add and enable the @EnableWebSocketMessageBroker annotation

Application.java

@SpringBootApplication
@EnableWebSocketMessageBroker//add to
public class Application extends SpringBootServletInitializer
{
    public static void main( String... args )
    {
         SpringApplication.run( Application.class, args );
    }
}

3. Added JavaConfig for WebSocket

WebSocketConfiguration.java

@Configuration
public class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer { //Inherit AbstractWebSocketMessageBrokerConfigurer and customize WebSocket related bean definition

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/chat").setAllowedOrigins("*").withSockJS();//Endpoints subscribed to by the front desk
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.setApplicationDestinationPrefixes("/sock");
        registry.enableSimpleBroker("/topic", "/queue");
    }
}

4. Controller settings

ChatController.java

@RestController
@RequestMapping("/chat/")
public class ChatController
{    
    @MessageMapping( "/chat/{accountId}" )
    @SendTo( "/topic/chat/all" )
    public ChatList all( @DestinationVariable Integer accountId, ChatMessage message ) throws InterruptedException
    {
    ...
    }

}

5. Front side SockJS settings

This time we use Angular Js1 system

ChatService.js

import SockJS from "sockjs-client";

export function ChatService($http, ChatStore) {
  let stompClient = {};
  var connect = ( $scope ) => {
    let socket = new SockJS( '/chat');
    stompClient = Stomp.over(socket);
    stompClient.connect({}, (frame) => {//WebSocket connection establishment
      stompClient.subscribe('/topic/chat/all', ( chatList ) => {
      ...
      });
    });
  }
  var send = () => {
    stompClient.send(`/sock/chat/${ChatStore.accountId}`, {},JSON.stringify({
      'value': ChatStore.message
    }));
  }
  return {
    connect,
    send
 };
}

Apache settings

httpd.conf

ProxyPass /chat/info ajp://localhost:8009/chat/info #URL that connects SockJS and WebSocket automatically generated by SpringWebSocket
ProxyPass /chat ws://localhost:8080/chat #ws proxy settings
ProxyPass / ajp://localhost:8009/ #ajp proxy settings

Operation check

With the above settings, the built-in Tomcat + Apache + WebSocket will work (should) work! !!

At the end

I've folded everything except the main points, but please forgive me as I will revise the article each time there is a mistake. .. .. orz

Well then.