It is require to make the tests passing on Java 11, but apparently it also speeds up tests on Java 8.

* [JENKINS-53693] - Update PowerMock and Mockito to a Java11-compatible version

* [JENKINS-53693] - Fix tests which depend on mocking

* [JENKINS-53693] - Apply fixes to PowerMock

* JENKINS-50412 - Fingerprints logs should be less verbose

Eliminate the logging line that says
possibly trimming /var/jenkins_home/fingerprints/[...]
This line fills up the fingerprints log file with repetitive, useless information.
The operation it calls provides its own logging that can be turned on if detailed
logging is actually needed instead of running this one repeatedly.

Also, while in the area, convert a couple of FileFilter inner classes to lambdas
and inline them. This reduces unnecessary boilerplate and improves clarity.

In order to make this change testable, I elected to remove the final restriction on the
class and annotate the class as restricted. This allows me to create unit tests for
this change and also verify existing capability at the appropriate level.

* Watch out for varying line endings.

Use a reliable check.

* Correct a few minor issues caught in review.

* Change to correct access modifier.

* Introduced ACL.lambda convenience method.

* Javadoc

* Introducing ItemGroup.allItems and similar default methods.

* Do not get me started.

Deprecate isBuildBlocked & getWhyBlocked in favor of getCauseOfBlockage, which you needed to implement anyway.

* [JENKINS-46759] Fixed bug related to views which filters build queue, jobs which has multiple sub steps were filtered incorrectly.

* Added test case for build queue filtering in views.

* [JENKINS-46759] Improved code based on feedback from PR; Fixed logic bug, moved logic to separate method and added limit to number of iteration when looking for owner task.

* [JENKINS-29537] EnvironmentContributingAction compatible with Workflow

+ Adds new method with default implementation in EnvironmentContributingAction to support Runs
+ Marks AbstractBuild as deprecated
+ Adds default implementation for deprecated method for backward
compatiblity.

* Tiny improvements in javadoc

PATH+XYZ

The getEnvironment(Node, TaskListener) now returns an environment setup
correctly with the platform value of the computer node where the job is
executed.

(cherry picked from commit cf0183d1)

PATH+XYZ

The getEnvironment(Node, TaskListener) now returns an environment setup
correctly with the platform value of the computer node where the job is
executed.

* Adding some interface default method implementations rather than catching AbstractMethodError or providing partial implementation classes.

* Show Javadoc warnings and errors, but not ‘Generating …/core/target/site/apidocs/jenkins/model/lazy/class-use/AbstractLazyLoadRunMap.html...’ and the like.

* Javadoc fixes.

* Review comments from @oleg-nenashev.

* Test fixes.

* Remove the unused import

* [JENKINS-42645] Case insensitive search by default

* [JENKINS-42960] Search in FixedSet more locale friendly

String.equalsIgnoreCase is safer than toLowerCase when non English
locales are used.

* [JENKINS-42645] Review remarks

* JENKINS-42319: Fix broken compareTo method of Run

Previous implementation relied on fact that users always compare run
objects with same parent. But this is not always the case.
So, it was not safe to put runs from different parents to TreeSet, i.e.

* Make comparasion more performance friendly

* spelling: abstract

* spelling: about

* spelling: absolute

* spelling: across

* spelling: activity

* spelling: actually

* spelling: addition

* spelling: allocating

* spelling: ambiguous

* spelling: analyzes

* spelling: analysis

* spelling: another

* spelling: appear

* spelling: arbitrary

* spelling: artifact

* spelling: assignment

* spelling: associated

* spelling: augment

* spelling: authentication

* spelling: automatically

* spelling: available

* spelling: availability

* spelling: because

* spelling: background

* spelling: beginning

* spelling: boolean

* spelling: browsers

* spelling: building

* spelling: calculation

* spelling: channel

* spelling: column

* spelling: concatenation

* spelling: connect

* spelling: contribute

* spelling: convert

* spelling: copied

* spelling: couldn't

* spelling: scrambled

* spelling: creates-a

* spelling: curr-entry

* spelling: customize

* spelling: diagnostic

* spelling: contain

* spelling: default

* spelling: delimiter

* spelling: descriptor

* spelling: disambiguates

* spelling: different

* spelling: diligently

* spelling: disabled

* spelling: discovered

* spelling: display

* spelling: doesn't

* spelling: dollar

* spelling: downstream

* spelling: dynamically

* spelling: preemptively

* spelling: encrypt

* spelling: erroneous

* spelling: examine

* spelling: existence

* spelling: value

* spelling: february

* spelling: handling

* spelling: hostname

* spelling: convenient

* spelling: identify

* spelling: implementation

* spelling: incorrect

* spelling: individual

* spelling: initialization

* spelling: initialized

* spelling: inputstream

* spelling: instantiated

* spelling: instantiation

* spelling: intended

* spelling: interpreted

* spelling: interrupted

* spelling: invocations

* spelling: kern

* spelling: localization

* spelling: logger

* spelling: malfunctioning

* spelling: methods

* spelling: monitor

* spelling: mutator

* spelling: multiple

* spelling: object

* spelling: configured

* spelling: optionally

* spelling: option

* spelling: overridden

* spelling: parameterized

* spelling: parent

* spelling: permissions

* spelling: plugin

* spelling: potentially

* spelling: preferable

* spelling: problems like

* spelling: programmatically

* spelling: property

* spelling: reallocate

* spelling: recommended

* spelling: redirected

* spelling: registered

* spelling: reliable

* spelling: remember

* spelling: recurrence

* spelling: repeatable

* spelling: repeated

* spelling: resource

* spelling: retrieve

* spelling: returned

* spelling: revision

* spelling: sandwich

* spelling: separator

* spelling: serialization

* spelling: settings

* spelling: shadow

* spelling: should

* spelling: someone

* spelling: source

* spelling: specified

* spelling: style

* spelling: subversion

* spelling: sufficient

* spelling: supplementary

* spelling: suppressing

* spelling: synchronization

* spelling: synchronized

* spelling: this

* spelling: transitioning

* spelling: termination

* spelling: trying

* spelling: truncatable

* spelling: unknown

* spelling: undeployed

* spelling: unnecessary

* spelling: unparseable

* spelling: update

* spelling: upper

* spelling: verify

* spelling: visible

* spelling: warning

* spelling: we're

* spelling: whitespace

* spelling: wide

* spelling: with

* spelling: workspace

* spelling: yielding

* spelling: to

* spelling: by

* spelling: the

* spelling: hours

The line separator length was assumed to be 1 byte wide, although it
could be 2 on some platforms (aka Windows).

* Coarse fix for JENKINS-39555 - don't do the actions initialization by helper method

* Small cleanup of docs, import

* Testcase

* Review changes

* Add some tests to  current behaviour of getLog method

* getLog(maxLines) reads only last maxLines lines now

It should speed up and reduce memory consumption for some plugins (i.e.
Email-ext Plugin).
Also now this method could be used to get last lines of build output in efficient manner.

* Fix issues from code review

- We cannot modify `replaceAction` to return the dirty flag, in fact most callers probably don't care... but if you do care, we now provide `addOrReplaceAction`
- Clarify the javadocs to reflect that these methods are not going to affect actions added by transient action factories

[FIXED JENKINS-39404] Restore symmetry by adding removeAction and removeActions methods to Actionable

[FIXED JENKINS-35967] - Make User#isIdOrFullnameAllowed() more robust against restricted usernames (#2413)

This change hardens username verification in user creation commands. See the issue to get rexamples.

https://issues.jenkins-ci.org/browse/JENKINS-35967

- A pure unit tests will suffice

(cherry picked from commit 136aeb86)

- A pure unit tests will suffice

* [JENKINS-33600] - User#isIdOrFullnameAllowed() should be tolerant against null parameters

* [JENKINS-33600] - Add the follow-up TODO

Tested with Java 8 and "mvn javadoc:test-javadoc".  Eliminates errors such as:

    [ERROR] java/hudson/os/DCOMSandbox.java:18: error: bad use of '>'

Eliminates errors with Java 8 and "mvn javadoc:test-javadoc" such as:

    [ERROR] jenkins/core/src/test/java/hudson/model/ItemsTest.java:12: error: unknown attribute: hef
    [ERROR] * @author: <a hef="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>

Fix for rejecting malformed ranges in
hudson.model.Fingerprint.RangeSet.fromString(...)

In addition to cluttering the namespace, unused imports generate
compiler warnings, introducing noise and obscuring more important
compiler warnings.  This change removes them.