Using Tomcat 7.0.27 websocket functionality.

[j3r]

Hi all, i have been following websockets for sometime. Here are two of the java implementations i found.
1.) jWebSocket - standalone, tomcat application, *.jar full-bundle
2.) Tomcat 7.0.27.0 - org.apache.catalina.websocket.WebSocketServlet

Below are a few ways i figured out, but unsure how can i go ahead.

Q1.) jWebSocket has a websocket factory. How can i set the XML so that i load the class as a bean and start it when the application starts?

[j3r]

I did try load an external Servlet, but not sure if i did it correctly.

I have a class MyWebSocket.java

package com.rts.web.rmdls;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;
// From tomcat 7.0.27.0
import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;

// Same example from tomcat website
// WebSocketServlet is a servlet implementation
public class MyWebSocket extends WebSocketServlet{
    ............. other code
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>

    <!-- ADDED NEW SERVLET-->
    <servlet>
        <servlet-name>websocketTest</servlet-name>
        <servlet-class>com.testapp.web.MyWebSocket</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>websocketTest</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    
    <welcome-file-list>
        <welcome-file>redirect.jsp</welcome-file>
    </welcome-file-list>
</web-app>

How do i verify that my new servlet is loaded?
I wrote a test page but http 404 returned for my websocket.

Cheers!
Many thanks!

[j3r]

Sorry, it did work. The problem was the url i used for WebSocket

Javascript code

<script type="text/javascript">

    <!-- 
            Conrrect url
            ws://localhost:8080/myapp/test.do
    -->
    var soc = new WebSocket('ws://' + window.location.host +'/myapp/test.do

    <!-- 
            Inconrrect url
            ws://localhost:8080/test.do
    -->
    var soc = new WebSocket('ws://' + window.location.host +'/test.do



</script>

Cheers!