Re: JSP and Portlets

I did the steps showed on that link but it doesn't work...Pluto can't start
it...the error is

25-feb-2008 9.29.42 org.apache.catalina.core.StandardContext listenerStart
GRAVE: Exception sending context initialized event to listener instance of
class org.apache.pluto.driver.PortalStartupListener
java.lang.NullPointerException

and my web.xml file is

<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>plutoPortalDriver</filter-name>
        <filter-class>org.apache.pluto.driver.PortalDriverFilter
</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>plutoPortalDriver</filter-name>
        <url-pattern>/about.jsp</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>plutoPortalDriver</filter-name>
        <url-pattern>/about.jsp/*</url-pattern>
    </filter-mapping>

    <listener>
        <listener-class>org.apache.pluto.driver.PortalStartupListener
</listener-class>
    </listener>

    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

 </web-app>