The spec for java.util.spi.LocaleServiceProvider says:
 Implementations of these locale sensitive services are packaged using the Java Extension Mechanism as installed extensions.

It would be good to have ability to put locale sensitive service providers also in other places system classloader may take from. I suggest the following text:

The locale sensitive services may be packaged in an implementation of the Java platform in the form of extensions, that is, jar files placed into any of the usual extension directories. The locale sensitive services may also be made available by adding them to the applet or application class path or by some other platform-specific means.