Update all utility classes so that they have a private constructor. This
prevents users from accidentally creating an instance, when they should
just use the static methods directly.
Issue gh-8945
Replace static imports with class referenced methods. With the exception
of a few well known static imports, checkstyle restricts the static
imports that a class can use. For example, `asList(...)` would be
replaced with `Arrays.asList(...)`.
Issue gh-8945
Migrate Mockito imports to use the BDD variant. This aligns better with
the "given" / "when" / "then" style used in most tests since the "given"
block now uses Mockito `given(...)` calls.
The commit also updates a few tests that were accidentally using
Power Mockito when regular Mockito could be used.
Issue gh-8945
Refactor `HeadersBeanDefinitionParser` and `AclImpl` to reduce the
number of nested if statements. A few extracted methods are now used
to hopefully improve readability.
Issue gh-8945
Add suppressions for existing `InterfaceIsType` violations. Ideally
theses should be classes, but we can't easily change them without
breaking binary back compatibility.
Issue gh-8945
Move all inner-types so that they are consistently the last item
defined. This aligns with the style used by Spring Framework and
the consistency generally makes it easier to scan the source.
Issue gh-8945
Replace code of the form `a = b =c` with distinct statements. Although
this results in more lines of code, they are usually easier to
understand.
Issue gh-8945
Apply an Eclipse cleanup rules to ensure that fields are always accessed
using `this.`. This aligns with the style used by Spring Framework and
helps users quickly see the difference between a local and member
variable.
Issue gh-8945
Update classes that have private constructors so that they are also
declared final. In a few cases, inner-classes used private constructors
but were subclassed. These have now been changed to have package-private
constructors.
Issue gh-8945
Phillip Webb