Cannot initialize context because there is already a root application context present - spring

Question

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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_2_5.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:/jpaContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>fitTrackerServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/servlet-config.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>fitTrackerServlet</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>fitTrackerServlet</servlet-name>
<url-pattern>/pdfs/**</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>fitTrackerServlet</servlet-name>
<url-pattern>/images/**</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>fitTrackerServlet</servlet-name>
<url-pattern>*.json</url-pattern>
</servlet-mapping>
<display-name>Archetype Created Web Application</display-name>
</web-app>
I was adding security to my demo application, (user-login) by using :this tutorial , I am getting error as: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!
I have added my web.xml, Later i found this tutorial, then error was coming: No bean named 'springSecurityFilterChain' is defined. In the tutorial they explained
The MessageSecurityWebApplicationInitializer will automatically register the springSecurityFilterChain Filter for every URL in your application. If Filters are added within other WebApplicationInitializer instances we can use #Order to control the ordering of the Filter instances.
I didnot understand the above message please help me with this

Answer 1

Edit your fitTrackerServlet servlet as:
<servlet>
<servlet-name>fitTrackerServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/servlet-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>