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We present oSCJ, an implementation of the draft of Safety Critical Java (SCJ) specification. SCJ is designed to make Java amenable to writing mission- and safety-critical soft- ware. It does this by defining a subset of the Real-time Specification for Java that trades expressiveness for verifia- bility. This paper gives a high-level description of our im- plementation of the first compliance level of the SCJ speci- fication, a library called oSCJ, and reports on performance evaluation on the Ovm real-time Java virtual machine. We compare SCJ to C on both a real-time operating system on the LEON3 platform and Linux on a x86. Our results suggest that a high-degree of predictability and competitive performance can indeed be achieved.