FULL PRODUCT VERSION :
java version " 1.7.0_11 "
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) Client VM (build 23.6-b04, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [version 6.1.7601]
But the bug is cross platform.

A DESCRIPTION OF THE PROBLEM :
When a Java program tries to create a SSL socket specifying an IP address instead of a host name, the JVM issues many unnecessary reverse DNS lookups.

After some hours investigating the problem, I found the following piece of code in class sun.security.ssl.SSLSocketImpl:

    synchronized String getHost() {
        // Note that the host may be null or empty for localhost.
        if (host == null || host.length() == 0) {
            host = getInetAddress().getHostName();
        }
        return host;
    }

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Note that, instead of getInetAddress().getHostName(), the 'host' variable should be set to getInetAddress().getHostAddress(), so Java does not do guesswork, for example, to check certificates against hostnames.


REPRODUCIBILITY :
This bug can be reproduced always.