lsof shows it's an IPv4 connection: 

perl 2221 root 7u IPv4 1768226357 TCP 
xyz-server.com:38178->xyz-server.com:7891 
(ESTABLISHED) 

Connection to port 7891 - the JVM used 

/usr/java/jdk1.6.0_21/bin/java org.perl.inline.java.InlineJavaServer 0 
localhost 7891 true false false