The .NET user group hosts the Kansas City Developers Conference every year. Each and every year they have broadened their scope. This year will host a record number of Java focused workshops. They best part is that it is only $100. I would encourage you to take a look at it at http://www.kcdc.info. I am holding 2 Spring related talks this year. RESTful web services with Spring MVC and and introduction to Spring Data. There is so much information available.