feat!: Java 21 for build and runtime (#7177)

* build: Update jacoco version to 0.8.11
* build: Enforce Java 21 and above check for build
* CI: Use Java 21 in Github CI workflows
* CI: Use Java 21 in circleci workflows
* build: Update gradle verification metadata for jacoco 0.8.11
* refactor: Fix javadoc related warnings which are applicable to Java 21
* fix(test): BackwardSyncAlgSpec slightly increase timeout to pass it in CI

---------

Signed-off-by: Usman Saleem <usman@usmans.info>

.github/workflows/acceptance-tests.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Install required packages
         run:  sudo apt-get install -y xmlstarlet
       - name: setup gradle

.github/workflows/codeql.yml

@@ -33,7 +33,7 @@ jobs:
       uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
       with:
         distribution: 'temurin'
-        java-version: 17
+        java-version: 21
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@2f93e4319b2f04a2efc38fa7f78bd681bc3f7b2f

.github/workflows/develop.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -67,7 +67,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -106,7 +106,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:

.github/workflows/integration-tests.yml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:

.github/workflows/pre-review.yml

@@ -45,7 +45,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -65,7 +65,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -93,7 +93,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Install required packages
         run:  sudo apt-get install -y xmlstarlet
       - name: Setup Gradle

.github/workflows/reference-tests.yml

@@ -34,8 +34,8 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: adopt-openj9
-          java-version: 17
+          distribution: semeru # IBM Semeru with OpenJ9
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:

.github/workflows/release.yml

@@ -19,11 +19,11 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
-      - name: Set up JDK 17
+      - name: Set up Java
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: 'temurin'
-          java-version: '17'
+          distribution: temurin
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -60,8 +60,8 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: adopt
-          java-version: 17
+          distribution: temurin
+          java-version: 21
       - name: Download zip
         uses: actions/download-artifact@eaceaf801fd36c7dee90939fad912460b18a1ffe
         with:
@@ -108,11 +108,11 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
-      - name: Set up JDK 17
+      - name: Set up Java
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: 'temurin'
-          java-version: '17'
+          distribution: temurin
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -132,7 +132,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -174,7 +174,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -214,7 +214,7 @@ jobs:
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: setup gradle
         uses: gradle/actions/setup-gradle@9e899d11ad247ec76be7a60bc1cf9d3abbb9e7f1
         with:
@@ -248,8 +248,8 @@ jobs:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       - uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: 'temurin' # See 'Supported distributions' for available options
-          java-version: '17'
+          distribution: temurin
+          java-version: 21
           cache: gradle
       - name: login to ${{ env.registry }}
         uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d

.github/workflows/sonarcloud.yml

@@ -17,11 +17,11 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
-      - name: Set up JDK 17
+      - name: Set up Java
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93
         with:
-          distribution: 'temurin'
-          java-version: '17'
+          distribution: temurin
+          java-version: 21
       - name: Cache SonarCloud packages
         uses: actions/cache@e12d46a63a90f2fae62d114769bbf2a179198b5c
         with: