Rework commit 4a69755b to remove the need for the ApplicationInfo class.
The updated code now uses the auto-configuration class to compute a
default persistence unit root location
Closes gh-6635
Due to the layout format change in 1.4, Spring Framework is no longer
able to compute a default persistence unit root URL. If a Spring Boot 1.4
application has JPA but does not have any entity, the application started
from a fat jar now fails with a quite cryptic exception.
This commit introduces `ApplicationInfo` as a general replacement for
the `ApplicationArguments` and `Banner` singleton beans that
`SpringApplication` registers on startup. `ApplicationInfo` also defines
the detected "main" `Class` that can be used to compute a last resort
URL that makes sense.
If such bean is available, `EntityManagerFactoryBuilder` now sets the
default persistence unit root location, preventing Spring Framework to
attempt to resolve an unknown location. Note that in our case the
persistence unit root location is actually useless: given the way the
persistence unit is created, nothing actually uses it but Hibernate, as a
compliant JPA provider, has to make sure this setting is set to a valid
URL nevertheless.
Closes gh-6635
Previously, the documentation included hand-written tables for the
application, production, and technical starters.
This commit replaces the hand-written tables with tables that are
generated automatically from all of the starter poms, thereby ensuring
that the documentation is automatically kept up-to-date as starters
are added and removed. An extra column provided a link to each
starter's pom on GitHub has also been added to the table. This makes
it easier for users to see exactly what each starter contains.
Closes gh-5267
