...and you will gain:
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>WicketApplication</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>com.abien.wicket.Application</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WicketApplication</filter-name>
<url-pattern>/wicket/*</url-pattern>
</filter-mapping>
<session-config><session-timeout>
30
</session-timeout></session-config>
<welcome-file-list>
<welcome-file/>
</welcome-file-list>
</web-app>
Special thanks to Geertjan Wielenga. It started with a conversation between Poznan and Gdansk at Netbeans world tour, and ended with a supported version of Wicket plugin in Netbeans :-). That's real community effect :-)
Btw. Wicket 1.4 works perfectly with EJB 3 in GF v2 - stay tuned.