The Registry API allows storing some well known
class types (primitive classes, String, URL etc.)
in a native format, so serialized value is not
created, and a convertor does not need to be provided.

It would be useful to enhance the basic types to
also include java.net.URI, which in J2EE 1.4
replaces java.net.URL for many purposes.

This will allow clients to also store
java.io.File, since there is an easy way to
round-trip between URI and File: new File(f.toURI()).

Additionally, a native way to store java.io.File
could be provided too (but this is less critical),
by delegating to the mechanism for saving
java.net.URI.

I am setting a high priority because java.net.URI
should be considered a basic type, and because it
allows indirectly allows storing java.io.File,
which can be very useful mainly to store
user-private settings.