This one worked
in struts.xml
<constant name="struts.action.excludePattern" value="/SchServlet"></constant>
in web.xml
<filter>
<filter-name>struts</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>SchServlet</servlet-name>
<servlet-class>com.vk.translate.report.SchServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SchServlet</servlet-name>
<url-pattern>/SchServlet</url-pattern>
</servlet-mapping>
reference: Struts2 exclude pattern not working