Page "Java Platform, Micro Edition" Paragraph 19

Operating systems targeting Java ME have been implemented by DoCoMo in the form of DoJa, and by SavaJe as SavaJe OS.

The latter company was purchased by Sun in April 2007 and now forms the basis of Sun's JavaFX Mobile.

The company IS2T provides Java ME virtual machine ( MicroJvm ), for any RTOS and even with no-RTOS then qualified as baremetal.

When baremetal, the virtual machine is the OS / RTOS: the device boots in Java.