I modified web.xml and added a filter along with init param org.atmosphere.filter included otherwise i will cause error.
<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">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>MeteorServlet</servlet-name>
<servlet-class>org.atmosphere.cpr.MeteorServlet</servlet-class>
<init-param>
<param-name>org.atmosphere.filter</param-name>
<param-value>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.useWebSocket</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.useNative</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.cpr.packages</param-name>
<param-value>org.atmosphere.samples</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>MeteorServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<error-page>
<location>/404page.jsp</location>
</error-page>
`