Spark is a Java server designed to provide various services to Flash clients. Its combines some well established open source projects (Jetty, Spring, OpenAMF, Hibernate, Rhino, Netty2) to form a single server. It’s designed to be modular and extensible also so it should be easy to adapt to your needs. As it’s still early days in this projects life.
Read more? Please visit
Spark | Java Flash Server web page
You can join a mailing list and download source code on Subversion server.