Abstract
A powerful feature of the JavaTM programming language is its user-definable class loading policy, which when combined with the namespace independence between class loaders, allows portable implementation of semi-dynamic program transformations. Such transformations can be used for a range of purposes, including optimization and semantic extension. In this paper we present a framework for semantic extensions in Java. This framework consists of a number of simple but powerful transformations that, among other things, allow us to semantically extend Java to provide orthogonal persistence. The use of semi-dynamic program transformations lends our orthogonally persistent Java a number of important qualities, including simplicity, portability and a clean model of persistence. Significantly, our implementations are efficient and can outperform (in some cases) PJamaTM, a well-known orthogonally persistent Java, which is based on a modified virtual machine. In addition to describing the application of these transformations to orthogonally persistent Java, we foreshadow their use in a number of other contexts, including dynamic instance versioning and instrumentation. Copyright © 2000 John Wiley & Sons, Ltd.
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