Estou com uma dúvida sobre este arquivo:
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>lojavitual</display-name>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
<param-value>messages</param-value>
</context-param>
<context-param>
<param-name>br.com.caelum.vraptor.encoding</param-name>
<param-value>UTF-8</param-value>
</context-param>
<context-param>
<param-name>br.com.caelum.vraptor.provider</param-name>
<param-value>br.com.caelum.vraptor.CustomProvider</param-value>
</context-param>
<context-param>
<param-name>br.com.caelum.vraptor.provider</param-name>
<param-value>br.com.caelum.vraptor.ioc.pico.PicoProvider</param-value>
</context-param>
<context-param>
<param-name>br.com.caelum.vraptor.provider</param-name>
<param-value>br.com.caelum.vraptor.util.hibernate.HibernateCustomProvider</param-value>
</context-param>
<context-param>
<param-name>br.com.caelum.vraptor.provider</param-name>
<param-value>br.com.caelum.vraptor.util.jpa.JPACustomProvider</param-value>
</context-param>
<filter>
<filter-name>vraptor</filter-name>
<filter-class>br.com.caelum.vraptor.VRaptor</filter-class>
</filter>
<context-param>
<param-name>br.com.caelum.vraptor.packages</param-name>
<param-value>br.com.caelum.lojavirtual</param-value>
</context-param>
<filter-mapping>
<filter-name>vraptor</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<error-page>
<exception-type>br.com.caelum.vraptor.interceptor.AuthenticationException</exception-type>
<location>/index.jsp</location>
</error-page>
</web-app>
O que pode ser modificado e o que não pode ? e o que vai implicar as modificações !?