Sun Microsystems is still the steward of the Java programming language and its related virtual machine and runtime environment. Despite its PR blackout as the $7.4bn acquisition of Sun by Oracle is mulled by European regulators, Java Enterprise Edition version 6, or Java EE 6, has been released. Sun has also delivered versions of its GlassFish Web application server and NetBeans development tools that are based on Java EE 6.
GlassFish implements the OSGi runtime, which allows for features to be dynamically added to the Java server as needed and for the skinniest possible Java stack to be deployed to support applications. Companies can create applications using the Web profile and then, using the GlassFish update center, move to the full Java EE 6 implementation to scale their Java applications out.
Read the whole story at http://www.theregister.co.uk/2009/12/11/sun_java_ee_6/