Packages 
Package Description
javax.realtime
This package encapsulates the core RTSJ module.
javax.realtime.control
This package encapsulates the Asynchronous Transfer of Control module.
javax.realtime.device
This package encapsulates the Device Access module.
javax.realtime.enforce  
javax.realtime.memory
This package encapsulates the Alternate Memory Management module.
javax.realtime.posix
This package encapsulates the POSIX module.