Drop extra blank lines.

Misc clean ups.

- else { if } -> else if
- new kind of Number() -> valueOf()
- String replaceAll(S,S) -> replace(CS,CS)
- Initialize collections on creation
- Use diamonds
- Create arrays with {}s.

Reclasify issues.

[CONFIGURATION-808] DefaultListDelimiterHandler.escapeList working only
for List<String> #137.

Test case and fix for https://issues.apache.org/jira/browse/CONFIGURATION-808 (#137)

Update tests from commons-pool2 2.10.0 to 2.11.1.

Update tests from commons-dbcp2 2.8.0 to 2.9.0.

Update optional com.fasterxml.jackson.core:jackson-databind from 2.12.3
to 2.12.4.

Organize.

Fix version for SpotBugs.

Bump commons.javadoc.version from 3.1.1 to 3.3.0.

Bump commons.jacoco.version from 0.8.6 to 0.8.7.

Bump commons.japicmp.version from 0.15.2 to 0.15.3.

Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

Bump checkstyle from 8.43 to 8.44 #132.

Bump checkstyle from 8.43 to 8.44 (#132)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.43 to 8.44.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.43...checkstyle-8.44)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-type: direct:production
  update-type: version-update:semver-minor
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Update Apache Commons VFS 2.8.0 -> 2.9.0.

Use final.

Simplify expressions.
Remove dead in-line comments.
Use primitive parsing.

Spell as 'writable'.

Update my developer entry.

Bump hsqldb from 2.5.1 to 2.5.2 #128.

Bump hsqldb from 2.5.1 to 2.5.2 (#128)

* Bump hsqldb from 2.5.1 to 2.6.0

Bumps hsqldb from 2.5.1 to 2.6.0.

---
updated-dependencies:
- dependency-name: org.hsqldb:hsqldb
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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* Bump HSQLDB from 2.5.1 to 2.5.2

(2.6.0 requires Java 11)

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Bump commons.animal-sniffer.version 1.19 -> 1.20.

Bump jackson-databind from 2.12.2 to 2.12.3 #127.

Bump jackson-databind from 2.12.2 to 2.12.3 (#127)

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.12.2 to 2.12.3.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson.core:jackson-databind
  dependency-type: direct:production
  update-type: version-update:semver-patch
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[Javadoc] Specify that typed getList returns null for missing key #100.

(doc) Specify that typed getList returns null for missing key (#100)

Based on this discussion:
https://mail-archives.apache.org/mod_mbox/commons-user/202102.mbox/%3CCAOoCORfb5z6uJ%3DKG0ESLOnM2G50fM7VoW1fKovCZFRSO54h-Xg%40mail.gmail.com%3E

Bump snakeyaml from 1.28 to 1.29 #126.

Bump snakeyaml from 1.28 to 1.29 (#126)

Bumps [snakeyaml](https://bitbucket.org/asomov/snakeyaml) from 1.28 to 1.29.
- [Commits](https://bitbucket.org/asomov/snakeyaml/branches/compare/snakeyaml-1.29..snakeyaml-1.28)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:production
  update-type: version-update:semver-minor
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[CONFIGURATION-801] Remove redundant initializer #110.

CONFIGURATION-800 - Remove redundant initializer (#110)

[CONFIGURATION-802] Use final #111.

CONFIGURATION-802 - Set field as Final (#111)

[CONFIGURATION-803] Java 8 lambda improvements and more #112.

CONFIGURATION-803 java8 lambda improvements (#112)

[CONFIGURATION-804] Redundant local variable #113.

CONFIGURATION-804 - Redundant local variable (#113)

Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

[CONFIGURATION-805] Use try with resource #114.

CONFIGURATION-805 - Use try with resource (#114)

Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

Bump checkstyle from 8.42 to 8.43 #121.

Bump checkstyle from 8.41 to 8.43 (#121)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.41 to 8.43.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.41...checkstyle-8.43)

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Upgrade checkstyle #118.

upgrade checkstyle (#118)

Bump commons-pool2 from 2.9.0 to 2.10.0 #124.

Bump commons-pool2 from 2.9.0 to 2.10.0 (#124)

Bumps commons-pool2 from 2.9.0 to 2.10.0.

---
updated-dependencies:
- dependency-name: org.apache.commons:commons-pool2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Bump spotbugs-maven-plugin from 4.2.0 to 4.2.3 #116.

Bump spotbugs-maven-plugin from 4.2.0 to 4.2.3 (#116)

Bumps [spotbugs-maven-plugin](https://github.com/spotbugs/spotbugs-maven-plugin) from 4.2.0 to 4.2.3.
- [Release notes](https://github.com/spotbugs/spotbugs-maven-plugin/releases)
- [Commits](https://github.com/spotbugs/spotbugs-maven-plugin/compare/spotbugs-maven-plugin-4.2.0...spotbugs-maven-plugin-4.2.3)

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Add Java 16 profile.

Bump actions/cache from 2.1.4 to 2.1.6 (#120)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.4 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2.1.4...v2.1.6)

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Update EasyMock from 4.2 to 4.3

Replace Java 15 with Java 16 in Travis CI.

Add GitHub code of conduct page that points to the Apache page.

Update `actions/setup-java` to v2.

Replace GitHub build for Java 15 with Java 16 and drop Java 16-ea.

Update dependencies.

- Update JUnit 4.13.1 -> 4.13.2.
- Update Jackson 2.12.1 -> 2.12.2.
- Update org.yaml:snakeyaml 1.27 -> 1.28.
- com.sun.mail:mailapi 1.6.5 -> 1.6.6.

Run the default Maven goal for GitHub Actions builds.

Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

Update dependencies.

- Bump actions/cache from v2 to v2.1.4 #99.
- Bump maven-checkstyle-plugin from 3.1.1 to 3.1.2 #97.
- Bump checkstyle from 8.39 to 8.41 #101.

Bump checkstyle from 8.39 to 8.41 (#101)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.39 to 8.41.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.39...checkstyle-8.41)

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Bump maven-checkstyle-plugin from 3.1.1 to 3.1.2 (#97)

Bumps [maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/apache/maven-checkstyle-plugin/releases)
- [Commits](https://github.com/apache/maven-checkstyle-plugin/compare/maven-checkstyle-plugin-3.1.1...maven-checkstyle-plugin-3.1.2)

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Bump actions/cache from v2 to v2.1.4 (#99)

Bumps [actions/cache](https://github.com/actions/cache) from v2 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2...26968a09c0ea4f3e233fdddbafd1166051a095f6)

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Update Apache Commons VFS 2.7.0 -> 2.8.0.

No need to nest in else.

Update commons-lang3 3.11 -> 3.12.0.

Use varargs.

Raise embedded if into parent if.

Clean up imports.

Remove trailing whitepsace.

Use the scale in the var name.

Javadoc: Sentences end in a period.

- Make private elements final where possible.

Update local name.

Use isEmpty().

Use isEmpty().

Use isEmpty().

Reuse constant.

Fix Checkstyle suppressions DTD link.

Fix Checkstyle configuration DTD link.

Fix Checkstyle suppressions DTD link.

Bump spotbugs-maven-plugin from 4.1.4 to 4.2.0 #93.

Bump spotbugs-maven-plugin from 4.1.4 to 4.2.0 (#93)

Bumps [spotbugs-maven-plugin](https://github.com/spotbugs/spotbugs-maven-plugin) from 4.1.4 to 4.2.0.
- [Release notes](https://github.com/spotbugs/spotbugs-maven-plugin/releases)
- [Commits](https://github.com/spotbugs/spotbugs-maven-plugin/compare/spotbugs-maven-plugin-4.1.4...spotbugs-maven-plugin-4.2.0)

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Bump jackson-databind from 2.12.0 to 2.12.1 #94.

Bump jackson-databind from 2.12.0 to 2.12.1 (#94)

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.12.0 to 2.12.1.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

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Update com.github.siom79.japicmp:japicmp-maven-plugin 0.15.1 -> 0.15.2.

Remove unused imports.

Collapse multiple identical catch clauses into one.

Breaking binary compatibility should break the build instead of
generating a report one might skip reading, especially for PRs.

Spring 4.3.27.RELEASE -> 4.3.30.RELEASE.

Bump jackson-databind from 2.11.3 to 2.12.0 #88.

Bump jackson-databind from 2.11.3 to 2.12.0 (#88)

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.11.3 to 2.12.0.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

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Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

Bump checkstyle from 8.36.2 to 8.39 #90.

Bump checkstyle from 8.36.2 to 8.39 (#90)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.36.2 to 8.39.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.36.2...checkstyle-8.39)

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Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-configuration

Bump actions/checkout from v2.3.3 to v2.3.4 #85.

Bump actions/checkout from v2.3.3 to v2.3.4 (#85)

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.3 to v2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2.3.3...5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f)

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Make GitHub build use the Maven default goal.

Use Character cache.