plugin-architecture

I'm following Justin Slattery's Plugin Architecture tutorial and trying to adapt it for Razor, instead of WebForm Views. Everything else (controllers, plugin assembly loading, etc) seems to be okay. However, I'm not able to get embedded Razor views to work properly. When I try to browse to the "HelloWorld/Index", I get the following error: The view at '~/Plugins/MyProjectPlugin.dll/MyProjectPlugin.Views.HelloWorld.Index.cshtml' must derive from WebViewPage or WebViewPage<TModel>. The exception is thrown by System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object

How would you implement a Plugin-system for your Java application? Is it possible to have an easy to use (for the developer) system which achieves the following: Users put their plugins into a subdirectory of the app The Plugin can provide a configuration screen If you use a framework, is the license compatible with commercial developement? First you need an interface that all plugins need to implement, e.g. public interface Plugin { public void load(PluginConfiguration pluginConfiguration); public void run(); public void unload(); public JComponent getConfigurationPage(); } Plugin authors