I create a sketch, then right-click on the SketchName.pde or the Project, select Run as->Processing Sketch, an applet skeleton appears and I get the ClassNotFoundException saying SketchName.class was not found.

It looks like the plugin does not perform any preprocessing or compiling.

I have tried both the core.jar delivered with the plug as the 0195 core.jar

I use the 0.3.1 processing eclipse plugin.