Openjit|a Reeective J a Va Jit Compiler | Short Version for the Oopsla'98 Reeection Workshop |

The so-called `Open Compilers' is a technique to incorporate various self-descriptive modules for language customization and optimization based on computational re ection. We apply the open compiler technique to a Java Just-In-Time compiler to develop the OpenJIT compiler, which allows class-speci c customization and optimization, fostering research of new compilation techniques such as application-speci c customization and dynamic optimizations. Benchmarks with the current prototype, which is almost entirely written in Java, have seen comparable benchmark results compared to traditional C-based JIT compilers.