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Message: [QUOTE="Roedy Green, post: 5157613"] When I first encountered Java, I was very excited about the notion of interfaces and dynamic loading. I thought it would let people plug in their own code to every conceivable utility. There are two catches. 1. arranging that java.exe will look for your dynamic class in the place where it is. It will not usually be bundled in the original jar. 2. arranging that java.exe will look for any auxiliary classes your plugin needs in the place where they live. A garden variety jar prevents java from looking anywhere else for classes. I thought I would write a short essay on this. What techniques are available? I have always skirted the problem by putting all classes in the original jar. [/QUOTE]