juro que leí el mail de nahuel y no se por q no me di cuenta que era el mismo problema
acá está el xml completo:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 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"
version="2.4">
<display-name>Wicket-TaskManager</display-name>
<!--
There are three means to configure Wickets configuration mode and they are
tested in the order given.
1) A system property: -Dwicket.configuration
2) servlet specific <init-param>
3) context specific <context-param>
The value might be either "development" (reloading when templates change)
or "deployment". If no configuration is found, "development" is the default.
-->
<filter>
<filter-name>wicket.Wicket-TaskManager</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>org.uqbar.progui.WicketApplication</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>wicket.Wicket-TaskManager</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>