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WebObjects is a an integrated suite of Java frameworks for rapidly developing scalable, sophisticated Internet and Enterprise applications. It is the most mature platform available for enterprise-level web, web service and java client (three-tier client-server) application development.
It provides a powerful and mature set of Object-Oriented frameworks for managing Object-Relational Mapping (ORM) to any JDBC-compliant database, Session Management, Undo/Redo/Revert, Ajax, Web Services, full Java Client applications, Rapid Application Development, Streaming Media, file upload/download and many other popular internet and enterprise application technologies.
Originally developed by NeXT Computer Inc., in the mid 1990s, it was ported by Apple to Mac OS X and Mac OS X Server in Objective-C and then completely translated to Java for version 5.0.
It is an incredibly flexible set of frameworks exemplified by Apple's own use of it for such varied applications as the iTunes Music Store, the on-line Apple Store, the .Mac group of services including Web-Mail and Calendaring and their website. as well as many applications developed and deployed by others!.
It has a very active developer community and offers excellent support through the very popular WebObjects Development and WO Deployment email lists.
In addition Apple, Inc. also provides free and paid-for support options.
As of WebObjects 5.3, the deployment of WebObjects built server applications is now permitted on any platform. The XCode license (within which WebObjects is included) reads:
D. WebObjects Software. Subject to the terms and conditions of this License, you may use, install and permit others to access the WebObjects deployment software included with the Developer Software to deploy application programs developed using Apple's WebObjects Software. You may also reproduce and distribute: (1) over a network, components of the WebObjects deployment software for installation and use by others ("Java Client End Users") on any remote computer's volatile memory (e.g. RAM) to enable Java Client functionality for the sole purpose of communicating with Apple's WebObjects Software that may be installed and executed on the same Apple-labeled computer on which you have installed the Developer Software (the "Licensed System"); and (2) both manually and automatically over a network, components of the WebObjects deployment software for installation and use by Java Client End Users on any remote computer's non-volatile memory (e.g. ROM) to enable Java Client functionality for the sole purpose of communicating with Apple's WebObjects Software that may be installed and executed on the Licensed System; provided that all distributions to Java Client End Users are made under terms that are at least as restrictive as those set forth in this License and contain the disclaimers and limitations set forth in Sections 6 and 7 of this License. Subject to the terms and conditions of this License, you may also deploy server applications built with the WebObjects Software on any platform.
Sections 6 and 7 are standard Apple license disclaimers of warranty and limitations of liability clauses. Deployment to other platforms requires WebObjects software be built as Java servlet for deployment on a servlet compatible server such as Apache Tomcat.