资料内容：

You can nest at most one instance of the following utility components by nesting acorresponding element inside your Context element:

.Loader - Configure the web application class loader that will be used to load servletand bean classes for this web application. Normally, the default configuration of theclass loader will be sufficient.

Manager - Configure the session manager that will be used to create, destroy, andpersist HTTP sessions for this web application. Normally, the default configuration ofthe session manager will be sufficient.

Realm - Configure a realm that will allow its database of users, and their associatedroles, to be utilized solely for this particular web application. If not specified, this webapplication will utilize the Realm associated with the owning Host or Engine.

Resources - Configure the resource manager that will be used to access the staticresources associated with this web application. Normally, the default configuration ofthe resource manager will be sufficient.

 WatchedResource - The auto deployer will monitor the specified static resource ofthe web application for updates, and will reload the web application if is is updated.The content of this element must be a string.