The Real-time Java Experts Group has defined the real-time specification for Java (RTSJ), which provides the following capabilities: (1) new memory management models that can be used in lieu of garbage collection, (2) access to raw physical memory. (3) a higher resolution time granularity suitable for real-time systems, and (4) stronger guarantees on thread semantics when compared to regular Java, i.e., the most eligible runnable thread is always run.