Hi,I'm assuming you are wanting to create a web application which consumes the services published by ArcGIS Server.You should be looking at one of the web APIs which we have for JavaScript, Flex or Silverlight even!There are some links below and forums for each of these products.General link : http://www.esri.com/getting-started/developers/get-started - Flex : http://www.esri.com/getting-started/developers/get-started/flex - Java Script: http://www.esri.com/getting-started/developers/get-started/javascriptThere are loads resources available on all of these products.Of course if you want to write native Java SE GIS applications then you're in the right place to get help on that subject.Good luckMark