This may or may not be the solution but thought I'd offer it up just in case...
You're error message says no *trusted* certificate. Could it be that the cacerts file for your client does not have the CA of the server as a trusted CA.
I had a similar problem whereby my web-service was running behind a self-signed certifcate therefore I needed to add the self-signed cert. as a trusted root CA to my clients cacerts file. (Although I think I got a slightly different error)
Hope this helps,
Webbo
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