Servlet plugins do not disable or uninstall

A servlet plugin will load fine the first time, but will not unload/reload when the plugin is uninstalled/reinstalled. In fact, it doesn't seem to unload, uninstall, or even disable at all. If you disable the servlet, it still keeps running. If you uninstall the plugin, the servlet keeps running. If you disable it, then uninstall the plugin, the servlet keeps running. It just will not die...