Closes gh-10561

See gh-10561

This commit clarifies the scope of the datasource initializr. In
particular, it is not possible to create the schema with that facility
and let Hibernate creates additional tables.

Closes gh-9048

Previously, if the file watcher thread tried to stop the
FileSystemWatcher when another thread was already stopping it a
livelock could occur. The livelock occurred because the file watcher
thread would attempt to lock a monitor that was being held by a thread
that had joined the file watcher thread and was waiting for it to die.

This commit avoid the livelock by narrowing the synchronization that's
used when stopping the FileSystemWatcher. The monitor is used to
obtain a reference to the file watcher thread in a thread-safe manner,
but it is released prior to joining the file watcher thread and
waiting for it to die. This will allow a parallel attempt by the
file watcher thread to stop itself to succeed.

Closes gh-10496

Closes gh-10484

Closes gh-10483

Closes gh-10482

Closes gh-10481

See gh-10475
See gh-10473

* gh-10457:
  Polish

Closes gh-10268

Previously, when deploying a Spring Boot application to a container,
the servlet context property source was not fully initialised until
the context was refreshed. This led to a problem where a value from a
property source with lower precedence would be seen during the early
stages of the application starting. Once the servlet context property
source had been initialized, its value for the property would then
become visible effectively making it appear as if the property's
value had changed during startup. This led to a specific problem
with determining active profiles.

If spring.profiles.active was set both in JNDI and via the servlet
context both profiles would end up being active, rather than the
more intuitive behaviour of the profiles made active via the servlet
context overriding those made active via JNDI.

This commit updates SpringBootServletInitializer so that it explicitly
creates the StandardServletEnvironment and initializes its property
sources using the servlet context. This is done before the application
is created and run, thereby ensuring that the servlet context
property source is available throughout the application's startup.

Closes gh-9972

Closes gh-10476

Closes gh-10475

Closes gh-10474

Closes gh-10473

Closes gh-10472

Closes gh-10381

Closes gh-10268

Closes gh-10362

Closes gh-10392

Closes gh-10268

* pr/10382:
  Add reference to Citrus simulator Spring Boot starter

Closes gh-10382

* pr/10412:
  Polish JacksonAutoConfiguration

This commit removes unused constructor parameters introduced in 0c2ecb7b.

Closes gh-10412

Closes gh-10416

See gh-10395

* pr/10411:
  Typo in external config documentation

Closes gh-10411

Closes gh-10397

Closes gh-10396

Closes gh-10395

Closes gh-10394

Closes gh-10393

* gh-10278:
  Polish "Align prefix match in BufferCounterService with DefaultCounterService"
  Align prefix match in BufferCounterService with DefaultCounterService