JBoss 4.2.0CR1: Servlet doesn't find annotated Session Bean

[juergen.zimmermann]

I have a stateless session bean annotated as follows:

@Stateless
@Local(KundenverwaltungLocal.class)
public class KundenverwaltungBean implements KundenverwaltungLocal { ...

In a servlet I have this @EJB annotation:

public class EinfachesServlet extends HttpServlet {
 @EJB
 private KundenverwaltungLocal kv;
 ...

However, the servlet's private attribute is null. What's my mistake? Any hint is appreciated!

BTW, web.xml has the version numbering for 2.5