Shibboleth Developers

Hi,

in order to implement a LoginHandler I followed the configuration/programming 
steps from:

  https://spaces.internet2.edu/display/SHIB2/IdPDevExtLoginHandler

Now I get the following error message in catalina.out during startup of IdP 
2.1.1:

 ...

Caused by: org.springframework.beans.FatalBeanException: Class 
[myshibbolethaai.authentication.login.MyShibbolethLoginHandler]
 for namespace [urn:mace:uni-kn:shibboleth:authn] does not implement the 
[org.springframework.beans.factory.xml.NamespaceHandler] interface

 ...

Import and declaration of class MyShibbolethLoginHandler are:

 import 
edu.internet2.middleware.shibboleth.idp.authn.provider.AbstractLoginHandler;

and

 public class MyShibbolethLoginHandler extends AbstractLoginHandler

I'm a spring-newbie and hope someone will help me.

Markus