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Harness is a Java-centric, experimental metacomputing system based on the principle of dynamic reconfigurability, not only in terms of the computers and networks that comprise the virtual machine, but also in the capabilities of the VM itself. These characteristics may be modified under user control via a "plug-in" mechanism that is the central feature of the system. This "plug-in" mechanism relies on the underlying class loader services which enable loading and accessing Java classes and resources from a set of software repositories. However, the specific class loading requirements imposed by Harness cannot be satisfied by any of the class loaders provided as a part of Java platform. In this paper we describe new, flexible, class loading techniques which are primarily intended to improve plug-in management and security aspects in the Harness system but can also benefit other applications, especially those collaboratively accessing shared Java resources.