Load Balancing Using web.xml

If you are wondering how you can test the performance of your newly developed application in a production environment, then probably you have to create a replica — which is not feasible in most of the cases. By following some simple tricks, you can create a production-like environment in your dev set-up only. A major restriction is the SSL, networking, load balancing, and clustering of the server for creating the replica of the production environment. Today, I would be telling you how to create a load balancing application in your dev environment using just web.xml.

Here's my reference from the Oracle site.

Create a dynamic web project in your IDE and place the below code in web.xml:

<web-app>
	<servlet>
		<servlet-name>HttpClusterServlet</servlet-name>
		<servlet-class>weblogic.servlet.proxy.HttpClusterServlet</servlet-class>
		<init-param>
			<param-name>WebLogicCluster</param-name>
			<param-value>localhost:7002|localhost:7003</param-value>
		</init-param>
		<init-param>
			<param-name>DebugConfigInfo</param-name>
			<param-value>ON</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>HttpClusterServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>HttpClusterServlet</servlet-name>
		<url-pattern>*.jsp</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>HttpClusterServlet</servlet-name>
		<url-pattern>*.htm</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>HttpClusterServlet</servlet-name>
		<url-pattern>*.html</url-pattern>
	</servlet-mapping>
</web-app>

Creat the WAR and deploy it into a new managed server that is not pointing to any of the clusters. Add the URLs of the managed servers for which you wish to use for the load balancing: <param-value>localhost:7002|localhost:7003</param-value>.

Access your application with the port number of the deployed load balancing application and you will get the required result. And you're done!