I would like to ask for a review of the API for setting the location of the
Derby database.

NetBeans 5.0 we will provide out-of-the-box support for the Derby database like
starting/stopping the server, registering the JDBC drivers and creating new
databases. These features will be provided by the Derby support module in
db/derby. However, this module will not bundle the Derby database itself.
Instead, the Derby database will be provided by the module in db/derby/bundled
and by the Sun Java System Application Server 8.2. Therefore an API is needed
for the Derby bundle module and the appserver plugin module to provide the
location of the Derby database.

The intended API category is friend and will be provided by the Derby support
module. The providing module and the client modules will all be in the
enterprise cluster.

The API consists of a class with two methods (see the attached diff). The
setDerbyLocation() method is used to set the location and getDerbyLocation() is
used to retrieve it. The getter is needed so that the API client can detect that
the location has already been set and not do it again.