The class path specified to the java launcher is expected to be a sequence of file paths. Previous releases incorrectly accepted a Windows path with a leading slash, for example `-classpath /C:/classes`, which is not the intended behavior. The implementation of the application class loader has been changed in JDK 9 to use the new file system API which detects that `/C:/classes` is not a valid file path. Existing applications specifying a file URI on the class path will need to change and specify a valid file path.