A paper describing the Java Virtual Machine Language (JVML) interpreter we have implemented as part of our trace tree just-in-time (JIT) compiler has been accepted to the ACM Conference on Principles and Practice of Programming in Java (PPPJ’07). What makes our JVML interpreter unique is the fact that its implemented in Java itself, just as the rest of our JIT compiler. Despite the use of a high-language such as Java, our interpreter is reasonably fast (slowdown 4-9 over the hand-optimized assembly language implementation used by Sun’s Hotspot VM). In addition, our interpreter is entirely type-safe and thus is not part of the trusted code base. This is an ideal approach to add an interpreter to a Java VM system that already supports compiled code execution but doesn’t have a builtin Java interpreter (such as IBM’s Jikes RVM).