Closes gh-17543

Fixes gh-17545

* pr/17496:
  Test the Gradle Plugin against Gradle 5.5.1

Closes gh-17496

See gh-17496

Setting the log file name to a random value in smoke tests
doesn't work because the logger context has already been initialized.

Using a random value for the logfile name caused
the logfile endpoint to return a 404 as the name
was resolved from the environment on every request.
This commit registers a bean for LogFile which is then
used by the logfile endpoint.

Fixes gh-17434

* gh-17480:
  Polish AbstractDependsOnBeanFactoryPostProcessor

Closes gh-17480

See gh-17480

* gh-16627:
  Polish "Set up MongoClient beans' dependencies by type rather than name"
  Set up MongoClient beans' dependencies by type rather than name

Closes gh-16627

See gh-16627

See gh-16627

* gh-17020:
  Polish "Allow depended on beans to be identified by type"
  Allow depended on beans to be identified by type

Closes gh-17020

See gh-17020

Prior to this commit, `AbstractDependsOnBeanFactoryPostProcessor`
could only identify depended on beans by name.

See gh-17020

Closes gh-17476

Fixes gh-17217

Closes gh-17446

Fixes gh-17465

Closes gh-17461

Closes gh-17445

Closes gh-17451

Closes gh-17449

Previously, if a user defined a MongoDbFactory bean but did not define
a client bean, MongoDataAutoConfiguration would back off leaving the
context without a MongoTemplate, etc.

This commit reworks the auto-configuration so that only the
auto-configuration of a MongoDbFactory is dependent on the existence
of a Mongo client bean. Auto-configuration of the other components
that depend on a MongoDbFactory will now continue in the absence of a
Mongo client bean.

Closes gh-17416

Closes gh-17428

Update `ValidationBindHandler` so that any non-null result returned by
the parent `onFailure` method triggers re-validation.

Fixes gh-17421

Previously, the context path was set to an empty string. The led to
Jetty logging a warning about an empty context path and then using
/ instead.

This commit avoids the warning while leaving the context path's end
result unchanged by setting the context path to /.

Closes gh-17399

Closes gh-17407

This commit adds dependency management for Infinispan's Spring 5
modules that are introduced in 9.4.9.Final. It also removes redundant
exclusions for the dependency management for its Spring 4 modules.

Closes gh-17346

Update `StringToEnumIgnoringCaseConverterFactory` so that the
`getLettersAndDigits` method correctly appends `char` elements
rather than `int` elements.

Closes gh-17327

Escape lines that look like variable references but should actually be
included verbatim.

Closes gh-17386

Escape lines that look like variable references but should actually be
included verbatim.

Closes gh-17386

Closes gh-17382

* gh-16894:
  Fix persistent session property name in reference docs

Closes gh-16894

See gh-16894

Previously, a regular expression of /./ was used to replace /./ with
/.  The '.'' in the expression matches any single character so the
replacement was more broadly applicable than it should have been. For
example, /a/ would be replaced with /.

This commit uses Pattern.LITERAL to compile the regular expression
from the CURRENT_DIR (/./) contant. This allows the constant to be
used to check for occurances of /./ in the string before attempting
replacement, while also ensuring that the '.' is treated literally.

Closes gh-17341

Closes gh-17378