Closes gh-15866

Closes gh-15766

Previously, DevTools would retry the upload of the changes to an
application in the event of a ConnectException. If a different
network-level failure occurred, it would not be retried and would
cause the file watching thread to die.

This commit attempts to make things more robust by retrying all
SocketExceptions and not just ConnectExceptions. A warning is
logged when a failure occurs. A separate debug message that
includes the exception is also logged.

Closes gh-10317

* pr/15950:
  Prevent imports on org.testcontainers.shaded.*
  Polish "Stop using imports from shaded dependencies"
  Stop using imports from shaded dependencies

See gh-15950

Closes gh-15950

See gh-15950

Closes gh-15868

* pr/15943:
  Polish "Add a link to SpringMockK in the Kotlin documentation"
  Add a link to SpringMockK in the Kotlin documentation

Closes gh-15943

See gh-15943

This works around a change in javadoc generation in JDK 11.0.2. See
https://bugs.openjdk.java.net/browse/JDK-8212233 for details.

Fixes gh-15948

Closes gh-15825

This commit splits the management context configuration for jersey
into two separate configurations depending on if the type is SAME or
CHILD. The configuration for the SAME context should only kick in if
there is no existing ResourceConfig bean.

Fixes gh-15891

Closes gh-15867

Closes gh-15863

Closes gh-15813

Closes gh-15812

Closes gh-15869

Closes gh-15865

Closes gh-15864

Closes gh-15945

Closes gh-15946

Closes gh-15944

Closes gh-15901
Closes gh-15638

Closes gh-15862

Closes gh-15878

See gh-15775

Closes gh-15890

Closes gh-15348

When Spring Security is misconfigured it's possible to switch from an anonymous user
to a normal user. When switching back again, the corresponding
AuthenticationSwitchUserEvent will have a null target user. Previously, Actuator's
AuthenticationAuditListener would throw a NullPointerException when it received such an
event.

This commit updates the audit listener to defensively handled events with a null target
user.

Closes gh-15767

* pr/15859:
  Polish contribution
  Polish 'Database Initialization' section

Closes gh-15859

See gh-15859