AOL Instant Messenger is one of the most popular instant messenging tools available today. It allows you to send instant messages to other people who use AIM. At the same time, it is possible to heavily customize AIM programs by using a protocol which is named TOC2.

The ability to review your code is one of the best methods to find bugs and other issues which can cause your program to perform poorly. In fact, one of the hardest things about writing a program is debugging it. When programmers get together and share their knowledge, it can help improve the overall quality of your Java applications.

Java Server Pages (JSP) is a Java API in J2EE which allows dynamic creation of web pages using Java. It has the same purpose as other existing technologies like CGI or PHP. In this tutorial you will learn about Lifecycle of JSP pages, Dynamic content generation, Invoking Java code using JSP scripting elements, JavaBeans for JSP and Error Handling.

An antipattern can be defined as a bad design in the Java language. Antipatterns will bring forth bad answers in a way that is easy for some people to understand. If you are programming with Java, it is important to understand both antipatterns and patterns. When you work with software programs, they will need to be maintained.

The class loading system for Java is both flexible and strong. It will allow your programs to gains access to class databases without having to link to "include" files which are static. It will load archive files which contain these classes and other tools from specific locations.

Java 2D may be the most obvious solution for programming 2D graphs in Java programs, but it's not the only one. This article proposes an elegant alternative in the form of Java Objects for Science (JSci), an open-source package that lets you create 2D bar graphs, pie charts, and line graphs in Swing.

After describing some basic programming of servlets, we will describe some advanced topics of servlets in this tutorial, viz., Session Tracking, Servlet Filters, Servlet Life Cycle Events, Including, forwarding and redirecting, Servlet Chaining and Applet Servlet Communication.

Learn how to create digital-certificate chains to test your software. IBM Software Engineer, Paul H. Abbott, clarifies this seldom-documented process by showing you how to use the freely available OpenSSL toolkit to create a certificate chain of any length. He also describes common certificate attributes and shows you some sample Java code for reading the certificates you create into a Java keystore.

Project Jxta is a community-run attempt to build a utility application substrate for peer-to-peer applications. The initial reference implementation of Jxta includes a command-line shell that allows experimentation with the core Jxta platform without programming. This article takes us through a hands-on tour of the <a href="http://www-106.ibm.com/developerworks/java/library/j-p2pint2?open&l=766,t=grj,p=Jxta2">Jxta shell</a>. You'll explore its command set and extend its capability by writing your own custom commands using the Java programming language.

This article leads you into the gray zone between modeling and method, with a look at requirements gathering via use case modeling. In particular, this article focuses on the relationship between user interfaces, system interfaces, and use case descriptions.