filtros para servlets

src/main/webapp/WEB-INF/web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
+    <filter>
+        <filter-name>RequestsFilter</filter-name>
+        <filter-class>asistencia.filters.RequestsFilter</filter-class>
+    </filter>
+    <filter-mapping>
+        <filter-name>RequestsFilter</filter-name>
+        <url-pattern>/servlet/*</url-pattern>
+        <url-pattern>*.jsp</url-pattern>
+    </filter-mapping>
     <servlet>
         <servlet-name>InterceptarRedireccionServlet</servlet-name>
         <servlet-class>asistencia.servlets.InterceptarRedireccionServlet</servlet-class>
@@ -32,13 +41,10 @@
         <servlet-name>RedireccionarServlet</servlet-name>
         <url-pattern>/vistas/redireccionarServlet</url-pattern>
     </servlet-mapping>
-    
     <error-page>
         <error-code>404</error-code>
         <location>/vistas/error/error.jsp</location>
     </error-page>
-    
-    
     <session-config>
         <session-timeout>
             30