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I am late here, but this might help someone looking for the answer. Typically servletRequest.getRemoteAddr() works.

In many cases your application users might be accessing your web server via a proxy server or maybe your application is behind a load balancer.

So you should access the X-Forwarded-For http header in such a case to get the user’s IP address.

e.g. String ipAddress = request.getHeader(“X-FORWARDED-FOR”);

Hope this helps.