Zones are an operating system abstraction for partitioning systems, allowing multiple applications to run in isolation from each other on the same physical hardware. This isolation prevents processes running within a zone from monitoring or affecting processes running in other zones, seeing each other's data, or manipulating the underlying hardware.
Virtualization plugin for GlassFish 4 (http://wikis.sun.com/display/GlassFish/3.2VirtualizationPlugins). This plugin allows GlassFish to deploy services on VMware ESX and ESXi hosts. The project is under development.