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Add Gradle Kotlin DSL build alongside Maven (dual-build overlay)
Add Gradle build files as a dual-build overlay on top of the Spring Boot 4.0 migration. Both Maven and Gradle builds coexist, allowing gradual adoption. Key changes: - gradle/libs.versions.toml: Version catalog with Boot 4.0.0, Spring Cloud 2025.1.0, Kotlin 2.2.0, and all shared dependencies - Root build.gradle.kts: Shared subproject config with dependency management, Java 17 toolchain, spring-boot-jackson2 bridge for Jackson 2/3 coexistence - settings.gradle.kts: All module includes with Spring/Confluent repos - Gradle 8.14 wrapper (required for Boot 4.0.0 compatibility) - Per-module build.gradle.kts for all 77 subprojects - Avro code generation via com.github.davidmc24.gradle.plugin.avro for 7 modules - Tests disabled for modules requiring external infrastructure (Couchbase, Kinesis/Kinesalite) matching Maven's skipTests configuration - JUnit platform launcher alignment for standalone library modules Signed-off-by: Aditya Parikh <adityamparikh@gmail.com> Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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‎.gitignore‎

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.apt_generated
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artifacts
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.vscode
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# Gradle
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.gradle/
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build/
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!gradle/wrapper/gradle-wrapper.jar
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!**/src/main/**/build/
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!**/src/test/**/build/

‎batch-producer-consumer/build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot)
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}
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dependencies {
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implementation(platform(libs.spring.cloud.dependencies))
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implementation(libs.spring.cloud.stream)
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implementation(libs.spring.cloud.stream.binder.kafka)
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implementation(libs.spring.kafka)
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testImplementation(libs.spring.cloud.stream.test.binder)
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testImplementation(libs.spring.kafka.test)
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}

‎build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot) apply false
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alias(libs.plugins.spring.dependency.management) apply false
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alias(libs.plugins.kotlin.jvm) apply false
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alias(libs.plugins.kotlin.spring) apply false
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}
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val aggregatorModules = setOf(
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"confluent-schema-registry-integration",
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"function-based-stream-app-samples",
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"image-thumbnail-samples",
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"image-thumbnail-stream-sample",
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"couchbase-stream-applications",
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"kafka-e2e-kotlin-sample",
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"kafka-security-samples",
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"kafka-streams-samples",
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"kinesis-samples",
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"multi-functions-samples",
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"multi-binder-samples",
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"partitioning-samples",
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"kafka-partitioning",
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"rabbit-partitioning",
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"routing-samples",
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"spring-cloud-stream-schema-registry-integration",
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"testing-samples",
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"transaction-kafka-samples",
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)
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allprojects {
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group = "io.spring.cloud.stream.sample"
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version = "0.0.1-SNAPSHOT"
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}
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subprojects {
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if (name in aggregatorModules) return@subprojects
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apply(plugin = "java")
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apply(plugin = "io.spring.dependency-management")
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val catalog = rootProject.the<VersionCatalogsExtension>().named("libs")
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the<io.spring.gradle.dependencymanagement.dsl.DependencyManagementExtension>().apply {
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imports {
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mavenBom("org.springframework.boot:spring-boot-dependencies:${catalog.findVersion("spring-boot").get()}")
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mavenBom(catalog.findLibrary("spring-cloud-dependencies").get().get().toString())
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}
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}
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configure<JavaPluginExtension> {
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toolchain {
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languageVersion = JavaLanguageVersion.of(17)
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}
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}
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dependencies {
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"implementation"(catalog.findLibrary("spring-boot-starter").get())
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"implementation"(catalog.findLibrary("spring-boot-starter-actuator").get())
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"implementation"(catalog.findLibrary("spring-boot-starter-webmvc").get())
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"implementation"(catalog.findLibrary("spring-boot-jackson2").get())
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"testImplementation"(catalog.findLibrary("spring-boot-starter-test").get())
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}
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tasks.withType<Test> {
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useJUnitPlatform()
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}
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}

‎confluent-schema-registry-integration/build.gradle.kts‎

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// Aggregator module — no build configuration needed

‎confluent-schema-registry-integration/confluent-schema-registry-integration-consumer/build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot)
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alias(libs.plugins.avro.gradle)
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}
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avro {
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setStringType("String")
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}
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tasks.named<com.github.davidmc24.gradle.plugin.avro.GenerateAvroJavaTask>("generateAvroJava") {
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source("src/main/resources/avro")
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}
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dependencies {
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implementation(libs.spring.cloud.stream.binder.kafka)
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implementation(libs.avro)
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implementation(libs.confluent.kafka.avro.serializer) {
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exclude(group = "org.slf4j", module = "slf4j-api")
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exclude(group = "org.slf4j", module = "slf4j-log4j12")
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}
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implementation(libs.confluent.kafka.schema.registry.client)
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}

‎confluent-schema-registry-integration/confluent-schema-registry-integration-producer1/build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot)
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alias(libs.plugins.avro.gradle)
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}
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avro {
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setStringType("String")
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}
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tasks.named<com.github.davidmc24.gradle.plugin.avro.GenerateAvroJavaTask>("generateAvroJava") {
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source("src/main/resources/avro")
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}
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dependencies {
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implementation(libs.spring.cloud.stream.binder.kafka)
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implementation(libs.avro)
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implementation(libs.confluent.kafka.avro.serializer) {
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exclude(group = "org.slf4j", module = "slf4j-api")
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exclude(group = "org.slf4j", module = "slf4j-log4j12")
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}
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implementation(libs.confluent.kafka.schema.registry.client)
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}

‎confluent-schema-registry-integration/confluent-schema-registry-integration-producer2/build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot)
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alias(libs.plugins.avro.gradle)
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}
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avro {
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setStringType("String")
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}
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tasks.named<com.github.davidmc24.gradle.plugin.avro.GenerateAvroJavaTask>("generateAvroJava") {
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source("src/main/resources/avro")
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}
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dependencies {
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implementation(libs.spring.cloud.stream.binder.kafka)
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implementation(libs.avro)
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implementation(libs.confluent.kafka.avro.serializer) {
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exclude(group = "org.slf4j", module = "slf4j-api")
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exclude(group = "org.slf4j", module = "slf4j-log4j12")
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}
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implementation(libs.confluent.kafka.schema.registry.client)
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}

‎function-based-stream-app-samples/build.gradle.kts‎

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// Aggregator module — no build configuration needed

‎function-based-stream-app-samples/couchbase-stream-applications/build.gradle.kts‎

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// Aggregator module — no build configuration needed

‎function-based-stream-app-samples/couchbase-stream-applications/couchbase-consumer/build.gradle.kts‎

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plugins {
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alias(libs.plugins.spring.boot)
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}
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dependencies {
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implementation(libs.couchbase.java.client)
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compileOnly(libs.spring.boot.configuration.processor)
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annotationProcessor(libs.spring.boot.configuration.processor)
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implementation(libs.spring.cloud.fn.config.common)
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testImplementation(libs.reactor.test)
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testImplementation(libs.testcontainers.couchbase)
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testImplementation(libs.testcontainers.junit.jupiter)
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}

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