It's probably worth testing the client side first with openssl.
It's probably worth testing the client side first with openssl openssl s_client -connect yourserver. Com:443 Check out the man page for further options. What happens when you access it with a web browser?
Firefox should provide you quite some information on the server cert. While it does not seem like you after client cert authentication this examples does show you how to use a custom SSLSocketFactory. It can also be set statically - if you don't have access to the connection.
From the stack trace, I would guess that it's a problem with the server's certificate (the trace originates from "checkServerTrusted" calls). You might want to try connecting to the URL with a web browser such as Firefox to see if you get an SSL error with more details.
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