The NoInterfaceViewInvocationHandler passes null as the invoked business interface to the Endpoint:

// finally pass-on the control to the endpoint
return endpoint.invoke(this.session, null, method, args);

Instead, it should be passing the no-interface view type http://download.oracle.com/javaee/6/api/javax/ejb/SessionContext.html#getInvokedBusinessInterface%28%29