See gh-16316

* gh-16311:
  Polish "Use HTTPS for external links from XML files where possible"
  Use HTTPS for external links from XML files where possible

See gh-16311

See gh-16311

* gh-16283:
  Use HTTPS to link to Apache License

Closes gh-16283

See gh-16283

* gh-16243:
  Polish "Update build and setup configuration to use HTTPS"
  Update build and setup configuration to use HTTPS

Closes gh-16243

See gh-16243

See gh-16243

Previously, the algorithm that computes the String representation of a
class reference and a property type was shared. This lead to generic
information for group's `type` and `sourceType` property.

This commit separates that logic in two: `getQualifiedName` is now
responsible to generate a fully qualified class name while the existing
`getType` is solely responsible to generate a type representation for the
property. Only the latter has generic information.

Closes gh-7236

Closes gh-7147

* pr/7073:
  Upgrade to Spring Integration 4.2.11

Closes gh-7073

Closes gh-6956

See gh-6956

See gh-6956

Closes gh-6936

Closes gh-6935

Closes gh-6934

Closes gh-6933

Closes gh-6932

Closes gh-6931

Closes gh-6930

Closes gh-6929

Closes gh-6910

This is an alternative to the fix made in 3b52909f which removed the
chown call entirely.

Prior to 3b52909f, the ownership of $PID_FOLDER was always changed even
when its value was /var/run. This was problematic as it could prevent
other services from creating their pid folder or file.

When a sub-folder is used, changing its ownership so that it’s owned by
the user that will run the app is desirable as it limits access to the
folder. Rather than removing the chown call entirely, this commit
ensures that it only happens when a sub-folder is being used to hold the
pid file.

Closes gh-6532

Closes gh-6914 (I hope)

Update the launch script so that it no longer changes ownership of the
PID_FOLDER.

Commit b24e736c had changed the chown
line from:
	chown "$run_user" "$PID_FOLDER/${identity}"
to:
	chown "$run_user" "$PID_FOLDER"

This meant that it was possible for the launch script to change
ownership of `/var/run` and prevent later processes from writing to
the folder.

Since PID_FOLDER is created before the chown statement, and that
the `checkPermissions` function runs to ensure that the PID file can
be written, it appears that the chown is not even required.

Fixes gh-6532

Add `spring.mvc.formcontent.putfilter.enabled` property to allow the
HttpPutFormContentFilter to be disabled.

Fixes gh-6519

Update `AbstractNestedCondition` to correctly group nested conditions
on members.

Fixes gh-6672

Closes gh-6835

See gh-6910

Add an explicit note that states that "spring.datasource.url" (or more
specifically "spring.datasource.class-name" that is inferred from the
former) is necessary to connect to a database. If the class-name isn't
specified, Spring Boot will attempt to auto-configure an embedded
database.

Closes gh-6907

Breaking API changes in Gradle 3.0 make it impossible to support
it reliably alongside Gradle 1 and 2 without mainintaining multiple
versions of our Gradle plugin. This commit updates the documentation
to note that Gradle 3 is not supported.

Closes gh-6880

Previously, in a war deployment, the web environment’s property sources
were initialized using the servlet context after the application’s
configuration had been read by ConfigFileApplicationListener. This
meant that spring.config.location configured via the servlet context
had no effect.

This commit adds a new ApplicationListener,
ServletContextApplicationListener, that initialises the configurable
web environment’s property sources using the servlet context. It’s
ordered with higher precedence than ConfigFileApplicationListener to
ensure that any properties defined in the servlet context are available
when loading the application’s configuration.

Closes gh-6801