Tomcat server will not start up with a filter

Tomcat server will not start up with a filter

Here is the web.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"
version="3.0">
<display-name>Projeto_joas</display-name>
<resource-ref>
<res-ref-name>jdbc/DiaDiaDev</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<servlet>
<display-name>FacesServlet</display-name>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.expressionFactory</param-name>
<param-value>com.sun.el.ExpressionFactoryImpl</param-value>
</context-param>
<!-- <filter> -->
<!--<filter-name>FilterHibernate</filter-name> -->
<!--<filter-class>util.filter.ConexaoHibernateFilter</filter-class> -->
<!--</filter> -->
<!--<filter-mapping> -->
<!-- <filter-name>FilterHibernate</filter-name> -->
<!--<url-pattern>*.jsf</url-pattern> -->
<!--</filter-mapping> -->
</web-app>
The server runs just fine this way, if i remove the comments on the
filter, it won't start and will throw me those exceptions:
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException:
org.apache.catalina.LifecycleException: Failed to start component
[StandardEngine[Catalina].StandardHost[localhost]] Caused by:
org.apache.catalina.LifecycleException: Failed to start component
[StandardEngine[Catalina].StandardHost[localhost]] Caused by:
org.apache.catalina.LifecycleException: A child container failed during
start
and
WARNING: Failed to retrieve JNDI naming context for container
[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Projeto_joas]]
so no cleanup was performed for that container
javax.naming.NamingException: No naming context bound to this class loader