Arjen Poutsma is a senior software engineer at SpringSource with fifteen years' experience in commercial software environments. During this time he has worked with both Java EE and Microsoft .NET.

Three years ago, Arjen started to specialise in Web Services and Service Oriented Architectures. During this period, he has worked for some of the largest organizations in the world helping them better understand enterprise Java and how SOAs fit into their organizations.

In part from his experiences with these organizations, Arjen founded the open source Spring Web Services project and continues to lead the technical direction and development as the project lead for Spring Web Services. This project aims at facilitating development of document-driven web services.

Arjen has also contributed to various other open source projects, including XFire, Axis2, and others. He is a regular speaker at Java and SOA conferences, including JavaPolis, The Spring Experience, JavaZone, W-JAX, and many others.

Eberhard Wolff has been working as a developer, consultant and trainer for enterprise solutions based on Java technologies ever since Java became available. He has authored three books including the first German book on Spring. He regularly contributes to conferences and writes articles for several journals. Eberhard is a founding member of the Java Champions and works as Regional Director for SpringSource in Germany.

Graeme Rocher is a software engineer, consultant and dynamic language expert who serves as Head of Grails Development at SpringSource. Graeme is project lead of the open source Grails web application framework and co-author of "The Definitive Guide to Grails"

In Graeme's current role as Head of Grails Development at SpringSource, the professional open source services company behind the Spring framework, Graeme leads the development of the Grails web framework and provides consulting, training and support to SpringSource's clients. Graeme is a frequent speaker at industry conferences on subjects related to Groovy, Grails and dynamic languages in Java.

Prior to joining SpringSource Graeme co-founded G2One - the Groovy/Grails Company - who were later acquired by SpringSource.

Rod Johnson is hot right now. The creator of Spring is about to sell his life's work, Springsource, to WMware. Price: $420 mill.

Rod is a thought leader on open source, as well as a popular speaker at conferences and symposia around the world. Spring was based on the code published with Rod's best-selling Expert One-on-One J2EE Design and Development (2002). This book was one of the most influential books ever published on J2EE and the sequel, J2EE without EJB (July 2004, with Juergen Hoeller), has proven almost equally significant, establishing a comprehensive vision for lightweight, post-EJB J2EE development.

At JAOO Rod will speak at 3 tracks. He is having a hard time recommending just one. But if you twist his arm around he will say Extreme Java Productivity with Spring Roo and Spring 3.0. With Spring Roo you use Java codes but in a quicker and more efficient way. Rod is very excited to present Spring Roo to danish developers and is expecting feedback!

Rod has specialized in server-side Java since 1996 across a wide range of industries. His hands-on experience has led him to see problems from a client's perspective as well as a technology perspective, and has driven his influential criticism of bloated, inefficient, orthodox approaches to J2EE architecture.

Rod is a member of the Java Community Process (JCP) Executive Committee (EC). EC members guide the evolution of the Java technologies by approving and voting on all technology proposals. They are also responsible for defining the JCP's rules of governance and the legal agreement between members and the organization.

Rod holds a BA with Honors in Computer Science, Mathematics and Musicology as well as a Phd from the University of Sydney.