WebDynpro Java - Redirect to another external URL - Fire EXIT Method in 7.3 Portal

[#1]

Hi All,

I've been referring to below methods to execute EXIT fireplug on InterfaceView in 7.3 runtime environment,

Redirecting Clients to Other Servers
https://help.sap.com/saphelp_nw74/helpdata/en/4c/59482414780d6ae10000000a15822b/frameset.htm

Redirecting to external URL in web dynpro application accessed in portal
https://archive.sap.com/discussions/thread/1600325

Code sample of sendRedirect using Web Dynpro NetWeaver 6.4
https://archive.sap.com/discussions/thread/78249

However, the issue is I'm unable to implement this EXIT fireplug. The steps followed are,
1. Create EXIT fireplug in InterfaceView with a parameter
2. In View, I could never resolve the below line, it always errors out. What is i'm missing?

wdThis.wdGetRedirectInterfaceViewController().wdFirePlugUrl("http://www.yahoo.com");

3. WindowControl shows below error, saying its missing the implementation part
Controller 'RedirectWindow': Implementation error: Missing outbound plug 'Exit' from interface view 'RedirectInterfaceView' of interface 'RedirectCompInterface'.

What are the missing pieces here in the approach? Appreciate your help.

Thanks