The module Classpath is for separating namespaces. It contains the abstraction of classpath to load binary class file data from. It does not contain references to ClassFile::JavaClassHeader nor does it parse the classes. It just provides the binary data (*.class files). A classpath is a composite containing classpath elements, e.g. libraries (JARs), folders, modules. It is low-level. For an example see how to count the number of classes in each module.