How to get TLS working

I've spent the last several days trying to enable TLS on the James 
server app and the imap and smtp servers.  Being a java noob, I'm taking 
the conf file text as absolute and getting nowhere.  It says in 5 of 
those server conf's I believe:

<!-- Set to true to support STARTTLS or TLS for the Socket.
            To use this you need to copy sunjce_provider.jar to 
/path/james/lib directory.
       -->
      <tls socketTLS="false" startTLS="true">
        <!-- To create a new keystore execute:
         keytool -genkey -alias james -keyalg RSA -keystore 
/path/to/james/conf/keystore
          -->

Generating the keystore was simple, but getting a hold of this 
mysterious file sunjce_provider.jar is proving impossible.  At least 
it's not on the hard drive of any of the 5 OSs and versions I've tried 
James on.  I browsed Bouncy Castle's website and now I'm just dazed.  Is 
it true that the sunjce file exists and is still used or is something 
else replacing it?  Every attempt to nail this down has been a dead 
end.  I can't find anything in the docs about it.  Am I missing 
something obvious here?

Regards,

Steve