Eclipse IDE is well known for Java project development. One of the reasons is that Eclipse is free and is easily extendable. Unfortunately no free and reliable plug-in was available for configuring J2EE environment on Eclipse IDE untill Lomboz. Lomboz is an open source and free J2EE development environment for businesses and individuals. You can develop, test, profile and deploy Web, Web services, Java, J2EE and EJB applications with this IDE. Lomboz has comprehensive support for most J2EE standard application server runtimes, and supports most popular open source runtimes such as JOnAS, and other vendor runtime environments. Lomboz is buillt on the Eclipse open source platform and the Web Tools Platform (WTP) projects. Here is the complete tutorial for configuring J2EE environment on Eclipse. It can be downloaded from Lomboz version of Eclipse
After Installing Lomboz