Accessing some details on an invalid certificate

[dpom]

I am using the Netty SslHandler for TLS over a custom messaging protocol. 
Client authentication is enabled, and I am accessing certificate details in
my channel handler using the following:

sslHandler.getEngine().getSession().getPeerPrincipal();

This is working fine when the client authenticates properly, but when a
client tries to connect with an invalid certificate, I want to log some
details about the bad certificate.  The javax.net.ssl.SSLSession object
throws a SSLPeerUnverifiedException when trying to access any details about
the bad client.

Has anyone had this problem before?  Any suggestions on how to access the
bad certificate within my handler?

Thanks.

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