Add generic contracts for object authenticity management

.github/workflows/ci.yaml

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+name: CI
+
+on: 
+  push:
+    branches:
+      - master
+      - "[0-9]+"
+      - "[0-9]+.[0-9]+"
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  check-generic-contracts-and-functions:
+    name: Gradle check for generic contracts and functions
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: generic-contracts-and-functions
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '8'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Check with Gradle
+        run: ./gradlew check
+
+      - name: Package artifacts
+        if: always()
+        run: |
+          rm -rf artifacts
+          mkdir -p artifacts
+          for x in ./*/build/reports/tests; do cp -a --parents $x ./artifacts/${x%%/*}; done
+          zip -r artifacts.zip artifacts
+
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: artifacts
+          path: artifacts.zip

.gitignore

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+##############################
+## Java
+##############################
+.mtj.tmp/
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+
+##############################
+## Maven
+##############################
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+pom.xml.bak
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+##############################
+## Gradle
+##############################
+bin/
+build/
+.gradle
+.gradletasknamecache
+gradle-app.setting
+!gradle-wrapper.jar
+
+##############################
+## IntelliJ
+##############################
+out/
+.idea/
+.idea_modules/
+*.iml
+*.ipr
+*.iws
+
+##############################
+## Eclipse
+##############################
+.settings/
+bin/
+tmp/
+.metadata
+.classpath
+.project
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.loadpath
+.factorypath
+
+##############################
+## NetBeans
+##############################
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+
+##############################
+## Visual Studio Code
+##############################
+.vscode/
+.code-workspace
+
+##############################
+## OS X
+##############################
+.DS_Store

generic-contracts-and-functions/build.gradle

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+plugins {
+    id 'com.diffplug.spotless' version '6.13.0'
+    id 'com.github.spotbugs' version '5.2.5'
+    id 'net.ltgt.errorprone' version '3.1.0'
+}
+
+apply plugin: 'java'
+apply plugin: 'idea'
+apply plugin: 'com.diffplug.spotless'
+
+ext {
+    scalarDlVersion = '3.9.0'
+    scalarDbVersion = '3.13.0'
+    junitVersion = '5.10.3'
+    junitPlatformVersion = '1.10.3'
+    mockitoVersion = '4.11.0'
+    assertjVersion = '3.26.0'
+    errorproneVersion = '2.10.0'
+    errorproneJavacVersion = '9+181-r4173-1'
+    spotbugsVersion = '4.8.6'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation group: 'com.scalar-labs', name: 'scalardl-java-client-sdk', version: "${scalarDlVersion}"
+    implementation group: 'com.scalar-labs', name: 'scalardb', version: "${scalarDbVersion}"
+    testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: "${junitVersion}"
+    testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: "${junitVersion}"
+    testImplementation group: 'org.junit.platform', name: 'junit-platform-console', version: "${junitPlatformVersion}"
+    testImplementation group: 'org.assertj', name: 'assertj-core', version: "${assertjVersion}"
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: "${mockitoVersion}"
+    testImplementation group: 'org.mockito', name: 'mockito-inline', version: "${mockitoVersion}"
+
+    // for Error Prone
+    errorprone "com.google.errorprone:error_prone_core:${errorproneVersion}"
+    errorproneJavac "com.google.errorprone:javac:${errorproneJavacVersion}"
+
+    // for SpotBugs
+    spotbugs "com.github.spotbugs:spotbugs:${spotbugsVersion}"
+    compileOnly "com.github.spotbugs:spotbugs-annotations:${spotbugsVersion}"
+    testCompileOnly "com.github.spotbugs:spotbugs-annotations:${spotbugsVersion}"
+}
+
+test {
+    useJUnitPlatform()
+}
+
+spotless {
+    java {
+        target 'src/*/java/**/*.java'
+        importOrder()
+        removeUnusedImports()
+        googleJavaFormat('1.7')
+    }
+}
+
+spotbugs {
+    ignoreFailures = false
+    showStackTraces = true
+    showProgress = true
+    effort = 'default'
+    reportLevel = 'default'
+    maxHeapSize = '1g'
+    extraArgs = [ '-nested:false' ]
+    jvmArgs = [ '-Duser.language=en' ]
+}
+
+spotbugsMain.reports {
+    html.enabled = true
+}
+
+spotbugsTest.reports {
+    html.enabled = true
+}
+
+sourceCompatibility = 1.8
+targetCompatibility = 1.8

generic-contracts-and-functions/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists