When VMware acquired SpringSource it also gained an OSGi runtime known as SpringSource dm Server, to which developers can directly build applications using the Spring and other development toolsets without the use of a J2EE application Server such as WebSphere or Tomcat (which is integrated into SpringSource dm Server for backwards compatibility. It is not entirely fanciful that the OSGi Runtime could, in due course, be made to run directly on the hypervisor, removing the requirement for a Guest O/S, leaving a complete VMware Enterprise Java stack.