How to download certificate for the first time programmatically?

Hi, I'm accessing a https server which has a self signed certificate for the first time. I was trying to download the certificate using like
cert = sslsession.getPeerCertificates()[0]
However I got the following exception: SSLPeerUnverifiedException
If I have the certificate on disk and I installed it using keytool to the keystore, I could see the keychain using this method. But is there a way in java to download the certificate for the first time?
Many thanks.
minji

hi ejp, thanks a lot for the link, it really helps a lot.
Now I'm having another problem. I could now download the certificate and store in my keystore. but if I immediately reconnect to the https web page, I still got the exception telling me the certificate was not found:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
This should not happen as I have already had this certificate in my keystore. If I rerun the program, there's no problem, indicating the certificate was really there. I first guessed I might have to again call System.setProperty("javax.net.ssl.trustStore", "mycacerts") but that does not help.
anybody with an idea?

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