Secure Tomcat Hosting: Restrict Access to Your Web Application – DZone Security

A developer gives a quick tutorial on how to add user authentication protocols to a Tomcat-based web application by writing a little bit of code in XML.
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How to Learn Java With Exploratory Programming – DZone Java

This collection of IDE support, Javadocs, and testing with JUnit is what one dev terms “exploratory programming.” See how to use it to write better code.
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To each their own style of learning, but these are some good thoughts.