Different plug-ins should not be able to obtain other plug-ins through reflection resource.

	PluginClassloader for each plug-in classes and resources provides a local isolation mechanism
	that will safeguard their load classes and resources, when loading plugin all the resources
	and classes only in PluginClassloader , and does not exist in the parent Classloader.

	When the plugin needs to load a resource, it will first load plugins own resources in PluginClassloader,
	and secondly then required to load in the parent Classloader