How to set value "auth.spnego.requireCredDelegation"?

Hi,

I trying to write a program that does Spnego/kerberoes delegation to jax-rs
web service. I am following the document

http://cxf.apache.org/docs/client-http-transport-including-ssl-support.html#ClientHTTPTransport(includingSSLsupport)-CredentialDelegation

It asks me to set property "auth.spnego.requireCredDelegation" to "true". I
am not sure where I need to set this property? in spring confile under
http-conduit? or progrmatically? Can someone please suggest a solution?

Thanks

Ramesh..