Name already in use

This just adds a Kotlin snippet alongside the Java snippet in the
reference manual.

Relates to gh-29727
Closes gh-27317

As the DSL internally calls `ResultActions.andExpect`, this is done with
a trick where a synthetic `ResultActions` is provided at top level which
stores each `ResultMatcher` in a mutable list.

Once the DSL usage is done, the top level DSL `andExpectAll` turns that
list into a `vararg` passed down to the actual `actions.andExpectAll`.

Closes gh-27317

…eWeaver is present

Closes gh-29736

There was a typo in the test, covering the wrong SQLState code.

Polishes a644245.
Relates to gh-29699.

… Driver 2.67

…12, SLF4J 2.0.6

Closes gh-29706

Closes gh-29699

Prior to this commit, extracting the path within handler mapping would
result in "" if the matching path element would be a Regex and contain
".*". This could cause issues with resource handling if the handler
mapping pattern was similar to `"/folder/file.*.extension"`.

This commit introduces a new `isLiteral()` method in the `PathElement`
abstract class that expresses whether the path element can be compared
as a String for path matching or if it requires a more elaborate
matching process.

Using this method for extracting the path within handler mapping avoids
relying on wildcard count or other properties.

Fixes gh-29712

Closes gh-29702

Found using regular expression: \b(\w+)\s+\1\b

Closes gh-29707

Closes gh-29694

Closes gh-29694

The block title style previously used was not rendered in HTML and the
title couldn't be differentiated from the text. Though, it was in the
PDF, as italics.

Introducing delimited blocks in the open (`--`) style did introduce
styling, but the vertical alignment isn't great.

This commit turns these block titles to actual (deep) section titles.
In the final HTML, at this depth there is no numbering but bold styling
is there. The PDF rendering has also been verified to have relevant
style.

Closes gh-29694

The link was previously named "Compared to WebFlux", which is easy to
mix up with the various links to equivalent sections in the WebFlux
chapter. Here the links point to a small section comparing the Servlet
Async API to the WebFlux stack from a high perspective.

In this commit we eliminate most of these links, except at the
beginning of the Asynchronous section. We also add a small mention of
the Servlet configuration in the comparison paragraphs, since the
Configuring section is the one furthest from the comparison paragraphs
that used to have a link to it.

Closes gh-29694

Closes gh-29694

Closes gh-29694

Closes gh-29694

Closes gh-29694

See gh-29697

This commit extracts the DTD/XSD remote lookup fallback from the
resolveEntity() method into a protected method.

A WARN-level logging statement is added to the extracted fallback in
order to make it clear that remote lookup happened.

Overriding the protected method would allow users to avoid this
fallback entirely if it isn't desirable, without the need to duplicate
the local resolution code.

Closes gh-29697