This page is to document the migration of IIS to nginx
Tomcat/Java configuration
I believe we need to setup Tomcat to use the RemoteIpValve:
https://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/valves/RemoteIpValve.html
An example is here:
http://kdl.nobugware.com/post/2010/02/12/nginx-ssl-tomcat-confluence