This valve encapsulates the basic behavior of the
StandardHost. It has two primary responsibilities:
Contextto process the request
invoke() method first obtains the
Context associated with the incoming Catalina
It then sets the context class loader of the current
Thread to the
ClassLoader associated with that
Context. This ensures that any class loading will occur in the context of the selected web application, and so will get a view of the world as described by the
WEB-INF/classes folders of that application.
It then invokes the pipeline associated with that
Context as follows: ...