Bug 1897454

+++ This bug was initially created as a clone of Bug #1897452 +++

Description of problem:
I updated OpenJDK from java-1.8.0-openjdk-1.8.0.265.b01-4.el8.x86_64 to java-1.8.0-openjdk-1.8.0.272.b10-3.el8_3.x86_64. Then my LDAP JNDI client code trhows the following exception:

{code}
javax.net.ssl|ALL|01|main|2020-11-13 13:00:19.543 JST|Logger.java:765|Invalidated session:  Session(1605240019463|TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)
javax.net.ssl.SSLPeerUnverifiedException: hostname of the server '' does not match the hostname in the server's certificate.
        at com.sun.jndi.ldap.ext.StartTlsResponseImpl.verify(StartTlsResponseImpl.java:447)
        at com.sun.jndi.ldap.ext.StartTlsResponseImpl.negotiate(StartTlsResponseImpl.java:225)
        at com.sun.jndi.ldap.ext.StartTlsResponseImpl.negotiate(StartTlsResponseImpl.java:170)
        at sample.LdapClientStartTLS.search(LdapClientStartTLS.java:38)
        at sample.LdapClientStartTLS.main(LdapClientStartTLS.java:24)
Caused by: java.security.cert.CertificateException: Illegal given domain name: 
        at sun.security.util.HostnameChecker.matchDNS(HostnameChecker.java:207)
        at sun.security.util.HostnameChecker.match(HostnameChecker.java:102)
        at sun.security.util.HostnameChecker.match(HostnameChecker.java:108)
        at com.sun.jndi.ldap.ext.StartTlsResponseImpl.verify(StartTlsResponseImpl.java:426)
        ... 4 more
Caused by: java.lang.IllegalArgumentException: Server name value of host_name cannot be empty
        at javax.net.ssl.SNIHostName.checkHostName(SNIHostName.java:314)
        at javax.net.ssl.SNIHostName.<init>(SNIHostName.java:108)
        at sun.security.util.HostnameChecker.matchDNS(HostnameChecker.java:205)
        ... 7 more
{code}

The same issue is reported in https://bugs.openjdk.java.net/browse/JDK-8214440, and the fix is provided in https://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/10149d2837c2.


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