Java Platform, Enterprise Edition or Java EE is Oracle's enterprise Java computing platform. The platform provides an API and runtime environment for developing and running enterprise software, including network and web services, and other large-scale, multi-tiered, scalable, reliable, and secure network applications. read more at WikiPedia

  •  iText is a library that allows you to generate PDF files on the fly. The iText classes are very useful for people who need to generate read-only, platform independent documents containing text, lists, tables and images. The library is especially useful in combination with Java(TM) technology-based Servlets: The look and feel of HTML is browser dependent; with iText and PDF you can control exactly how your servlet's output will look.
    iText requires JDK 1.2. It's available for free under a multiple license: MPL and LGPL. It also have a complete list of features (but outdated), and let you perform operation on already created pdf (concat, split, add pages, add an overlay and so on...)