Despite Azul Zing is not an RTSJ implementation (but rather a J2SE implementation), they claim this JVM is capable of running real-time applications due to the pauseless C4 garbage collector.
More on C4:
- http://www.azulsystems.com/sites/default/files//images/wp_pgc_zing_v5.pdf
- http://www.azulsystems.com/sites/default/files/images/c4_paper_acm.pdf
