- XML Technologies (XML, XSL, XSLT, XQUERY, etc.)

- Enterprise Java Beans and Java Persistence API

- Web Services and 2nd generation Web Services

- Structured Systems Integration

   * Service Oriented Architecture (SOA)

   * Enterprise Service Bus (ESB)

- Middleware for Enterprise Systems

   * Distributed transactions, long transactions, business activities, message-oriented middleware

- Integration of legacy systems

- Extra-organization integration and business partners

   * UCCnet, RosettaNet and ebXML

- Security for large-scale enterprise systems

- Reliability and fault-tolerance in enterprise systems

- Cloud computing systems

Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions, by Gregor Hohpe & Bobby Woolf, Addison-Wesley Professional, ISBN: 0321200683 Service-Oriented Architecture: A Field Guide to Integrating XML and Web Services, by Thomas Erl, Prentice Hall PTR, ISBN: 0131428985 IT Architectures and Middleware: Strategies for Building Large, Integrated Systems (2nd Edition), by Chris Britton, Peter Bye Addison-Wesley Professional, May 2004 Enterprise Application Integration, by David Linthicum, Addison-Wesley, ISBN 0201615835, December 1999 Next Generation Application Integration, by D. Linthicum, Addison-Wesley, ISBN 0201844567, 2004 Developing Java Web Services: Architecting and Developing Secure Web Services Using Java, by Ramesh Nagappan et. al., Wiley International XML Bible (2nd Edition), by Elliotte Rusty Harold, Wiley, 2001, ISBN 0764547607 Blueprints for High Availability, 2nd Ed., by Evan Marcus and Hal Stern, Wiley, ISBN 0471430269, Sep/2003