how to a jvm load a project(many classes in it)

Question

how to jvm load a project, including many classes in it? Does jvm has a class map of the whole project. How to jvm get the map of those classes? Can I get any class of this project at any time from the jvm, no matter the class is not loaded in jvm or it has finished its job and has been terminated? I know that it is possible to load class before start, and to get class during the class was running in jvm, but what about it is terminated. Does any one has any references? Thanks for your time.