Predictable Real-Time Java Profile Based on RTSJ

Based on the analysis of limitations of existing real time specification for Java (RTSJ) and Java developing model, we have designed a predictable real time Java developing profile which can be used to develop embedded high-reliability real-time systems. The profile adopts a three-layer developing architecture, including creation layer, execution layer and recycle layer. The creation layer creates and starts various groups of threads and objects. The execution layer executes threads that have been started. The recycle layer recovers the memory that is no longer in use. The application practice shows that the mechanisms, such as creating various groups of threads, periodic garbage collection, etc, not only guarantee the predictability of system developed with this profile, but also reduce memory usage of system requirement.