The javax.security.cert is being deprecated in JDK-8073430. Some methods in the internal sun.net.* and com.sun.net.* packages use the javax.security.cert.X509Certificate type, however. These methods should be removed or changed to use java.security.cert.Certificate instead.

These methods can probably be removed:
com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getServerCertificateChain()
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getServerCertificateChain()
sun.net.www.protocol.https.HttpsClient.getServerCertificateChain()
sun.net.www.protocol.https.HttpsURLConnectionImpl.getServerCertificateChain()

This method may have to be modified:
com.sun.net.ssl.HttpsURLConnection.getServerCertificateChain()