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https connection probs

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I had the following code to connect to a site on a server. It worked fine, now the server is using https, which causes the error

javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: Couldn't find trusted certificate

I have saved the certificate for reference and I assume to I need to tell the program to look at that but this will happen every time there is a new certificate (the program needs to look at different servers), so is there a way to trust-all sites or something to get this to work? I've looked on other forums and they mention this but I'm not clear how to do it exactly.

Changing the HttpURLConnection object to HttpsURLConnection throws up a 'java.lang.ClassCastException' error coz its an abstract class.. Any ideas? Thanks a lot
Don't get me started about those stupid light bulbs.
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