The RTSJ Reference Implementation (RI) defines Java technology conformance. The Technology Compatibility Kit (TCK) is the official test suite for the RTSJ. TimeSys is proud to be the Real-Time Specification for Java (RTSJ) Maintenance Lead, and to have built the official RI for the RTSJ.

Only TimeSys is authorized through the Java Community Process to maintain and modify the RTSJ and the TCK required to certify RTSJ compliance.