Agile software development is a group of software development methods based on iterative and incremental development, where requirements and solutions evolve through collaboration.

Object Oriented Design principles are very important and are sometimes considered even more important than design patterns. All design patterns are based on one or more of the design principles. Having thorough understanding of the design principles will help you understand the design paterns better and faster, and will even help you solve many design scenarios if you can't find a design pattern fitting that scenario.

RequestDispatcher mechanism used for forwarding to and including other resources. We will understand the basics of RequestDispatcher mechanism using a simple exercise.

Before proceeding, you need to configure your eclipse and tomcat. I am using eclipse Eclipse Java EE IDE for Web Developers version: Luna and Apache Tomcat version 8.0.18. Apache Tomcat version 8.0.18 support Servlet Spec 3.1, JSP Spec 2.3, EL Spec 3.0, WebSocket spec 1.1 and support java version 7 and above.

Java concurrency package give you the ability to use explicit locks. With explicit locks, you can see if a lock is available and acquire only if it is available. This way you can avoid deadlocks. We already wrote a deadlock simulation program without using explicit locks and then a deadlock simulation program using explicit locks.

Java concurrency package give you the ability to use explicit locks. With explicit locks, you can see if a lock is available and acquire only if it is available. This way you can avoid deadlocks. We already wrote a deadlock simulation program without using explicit locks and now we will write the same program using explicit locks. This is just a rewrite and hence will also deadlock like hte older one.