How to add a tab?

Hi,

I downloaded latest CruiseControl, binaries 2.8.2.
>From documentation I found out that I can implement Widget interface
and modify dashboard-config.xml to add my own tab. So I implemented my
widget:

public class SecondWidget implements Widget {

    public String getDisplayName() {
        return "My Widget";
    }

    public Object getOutput(Map parameters) {
        return "Hello";
    }
}

and modified dashboard-config.xml:

<dashboard>
     <buildloop
        logsdir="logs"
        artifactsdir="artifacts" />
    <features allowforcebuild="true"/>
    <trackingtool projectname="project1"
baseurl="https://mingle05.thoughtworks.com/projects/project1/cards/"
keywords="#,build,story,card"/>
    <trackingtool projectname="project2"
baseurl="https://mingle05.thoughtworks.com/projects/project2/cards/"
keywords="#,build,story,card"/>
    <subtabs>
        <subtab
class="net.sourceforge.cruisecontrol.dashboard.widgets.ErrorsAndWarningsMessagesWidget"
/>
        <subtab
class="net.sourceforge.cruisecontrol.dashboard.widgets.MergedCheckStyleWidget"
/>
      <subtab class="net.sourceforge.cruisecontrol.dashboard.widgets.PanopticodeWidget"
/>
      <subtab class="org.dubik.widgets.SecondWidget" />
    </subtabs>
 </dashboard>


Without my widget everything works fine. I can see 3 new tabs: Errors,
CheckStyle and Panopticode. When I add my own, i get this:
HTTP ERROR: 500

argument type mismatch

RequestURI=/dashboard/tab/build/detail/Money
Caused by:

java.lang.IllegalArgumentException: argument type mismatch
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeExceptionHandler(MultiActionController.java:646)
	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleException(MultiActionController.java:616)
	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:451)
	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:384)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:858)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

If I remove compiled widget from WEB-INF/classes, I only get error in
console saying that my widget can't be instantiated, so I'm pretty
sure it's not a class loading issue.

Do I need to do anything else to get my widget displayed?

Thanks.

br,
Sergiy

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