simple portlet deploying

[Sascha Glass]

hi there.
 
i am new to jetspeed and just want to deploy a little helloWorld
portlet. i've got this error:
 
"Encountered the following problem(s) while attmepting to render portlet
fragment: helloWorld_portlet
Failed to retrieve Portlet Definition for hello::HelloWorld
org.apache.jetspeed.container.window.FailedToRetrievePortletWindow: No
PortletEntity exists for for id helloWorld_portlet removing window from
cache.
Failed to retrieve Portlet Definition for hello::HelloWorld"
 
seems that something is not right with the portlet.xml..
 
here it is (in /WEB-INF):
 
<?xml version="1.0" encoding="UTF-8"?>
<portlet-app id="hello" version="1.1">
   <portlet>
      <portlet-name>HelloWorld</portlet-name>
      <display-name>Hello World portlet (JSR)</display-name>
      <display-name xml:lang="en">Hello World portlet
(JSR)</display-name>
      <portlet-class>HelloWorld</portlet-class>
      <supports>
         <mime-type>text/html</mime-type>
         <portlet-mode>view</portlet-mode>
      </supports>
      <supported-locale>en</supported-locale>
      <portlet-info>
         <title>Hello World (JSR)</title>
      </portlet-info>
   </portlet>
</portlet-app>
 
 
and thats the <fragment> in the default-page.psml:
 
<fragment id="helloWorld_portlet" type="portlet"
name="hello::HelloWorld">
      <property layout="TwoColumns" name="row" value="4" />
      <property layout="TwoColumns" name="column" value="1" />
</fragment>
 
does anyone know why this exception is thrown?