These subsystems are infrastructure subsystems that just are there for every other subsystem to use.
They are all insignificant enough not to be mentioned when listing dependencies.
Logging
Calls can be spread all over that would go through some rule set and then end up on file, on the output or not at all.
Internationalization
This is the set of files that is a repository of localized strings. Every other module uses these strings in all communications with the user.
The Internationalization Subsystem is described in detail in Section 5.13, “Internationalization”.
JRE with utils
Every other subsystem can use the classes available with the JRE.