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‎.gitignore

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/.gradle
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/.idea
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/out
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/build
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*.iml
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*.ipr
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*.iws
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### Gradle template
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.gradle
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/build/
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# Ignore Gradle GUI config
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gradle-app.setting
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# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
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!gradle-wrapper.jar
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# Cache of project
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.gradletasknamecache
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# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
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# gradle/wrapper/gradle-wrapper.properties
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### Kotlin template
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# Compiled class file
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*.class
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# Log file
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*.log
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# BlueJ files
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*.ctxt
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.nar
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*.ear
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*.zip
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*.tar.gz
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*.rar
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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### Java template
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# Compiled class file
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# Log file
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# BlueJ files
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# Mobile Tools for Java (J2ME)
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# Package Files #
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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### JetBrains template
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
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# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/**/usage.statistics.xml
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.idea/**/dictionaries
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.idea/**/shelf
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# Generated files
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.idea/**/contentModel.xml
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# Sensitive or high-churn files
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/**/dbnavigator.xml
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# Gradle
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.idea/**/gradle.xml
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.idea/**/libraries
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# Gradle and Maven with auto-import
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# When using Gradle or Maven with auto-import, you should exclude module files,
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# since they will be recreated, and may cause churn. Uncomment if using
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# auto-import.
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# .idea/modules.xml
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# .idea/*.iml
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# .idea/modules
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# *.iml
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# *.ipr
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# CMake
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cmake-build-*/
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# Mongo Explorer plugin
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.idea/**/mongoSettings.xml
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# File-based project format
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# IntelliJ
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out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Cursive Clojure plugin
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.idea/replstate.xml
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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fabric.properties
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# Editor-based Rest Client
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.idea/httpRequests
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# Android studio 3.1+ serialized cache file
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.idea/caches/build_file_checksums.ser

‎Docker

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FROM openjdk:8-jre-alpine
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ENV APPLICATION_USER ktor
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RUN adduser -D -g '' $APPLICATION_USER
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RUN mkdir /app
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RUN chown -R $APPLICATION_USER /app
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USER $APPLICATION_USER
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COPY ./build/libs/simple-gl-0.0.1-all.jar /app/simple-gl-0.0.1-all.jar
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WORKDIR /app
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CMD ["java", "-server", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-XX:InitialRAMFraction=2", "-XX:MinRAMFraction=2", "-XX:MaxRAMFraction=2", "-XX:+UseG1GC", "-XX:MaxGCPauseMillis=100", "-XX:+UseStringDeduplication", "-jar", "simple-gl-0.0.1-all.jar"]

‎README.md

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# simple-gl
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Simple general ledger application.
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## Run instructions
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1. Run `./gradlew build` command
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2. After successful build go to the `build/libs` directory
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3. Then run app using following command `java -jar simple-gl-0.0.1-all.jar`
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## Two modes
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Application logic implemented twice within two similar approaches.
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The first approach kinda `actor` based.
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Programm state and all communications are handled by actors.
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The second one is `eventstorming`.
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I have used `axon` framework to get beautiful `DDD` and `CQRS` out of the box.
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The `actor` approach is active by default but you can switch it using ``MODE`` environment variable.
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Just set it to `axon` and run application.
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## Project structure
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Project code structured by following packages.
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1. ``actor`` - Kotlin actor based approach
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2. ``axon`` - Axon based approach
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3. ``core`` - API that implemented in packages above.
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4. ``rest`` - REST API facade
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5. ``utils`` - Utility functions
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## Public API
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Examples of all queries could be found in ``resources`` folder.
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### account
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`POST /account` - Will create new account.
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`GET /account/{id}` - Will return account balance.
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`PUT /account/{id}/deposit` - Will deposit money to account.
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`PUT /account/{id}/withdraw` - Will withdraw money from account.
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### transfer
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`POST /transfer` - Will create transfer with specified `{amount}` of money from `{from}` account id to `{to}` account id.
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`POST /transfer/{id}` - Will return transfer status.

‎build.gradle.kts

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import org.jetbrains.kotlin.gradle.dsl.Coroutines
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import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
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val ktor_version: String by project
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val kotlin_version: String by project
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val logback_version: String by project
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val axon_version: String by project
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val javax_version: String by project
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plugins {
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application
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kotlin("jvm") version "1.3.31"
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id("com.github.johnrengelman.shadow") version "5.0.0"
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}
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group = "simple-gl"
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version = "0.0.1"
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application {
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mainClassName = "io.ktor.server.cio.EngineMain"
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}
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repositories {
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mavenLocal()
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jcenter()
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maven { url = uri("https://kotlin.bintray.com/ktor") }
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}
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dependencies {
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compile("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version")
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compile("io.ktor:ktor-server-cio:$ktor_version")
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compile("ch.qos.logback:logback-classic:$logback_version")
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compile("io.ktor:ktor-server-core:$ktor_version")
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compile("io.ktor:ktor-server-host-common:$ktor_version")
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compile("io.ktor:ktor-jackson:$ktor_version")
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compile("org.axonframework:axon-configuration:$axon_version")
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compile("org.axonframework:axon-modelling:$axon_version")
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compile("javax.inject:javax.inject:$javax_version")
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testCompile("io.ktor:ktor-server-tests:$ktor_version")
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testCompile("org.axonframework:axon-test:$axon_version")
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}
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kotlin.sourceSets["main"].kotlin.srcDirs("src")
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kotlin.sourceSets["test"].kotlin.srcDirs("test")
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sourceSets["main"].resources.srcDirs("resources")
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sourceSets["test"].resources.srcDirs("testresources")
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tasks.withType<Jar> {
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manifest {
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attributes(
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mapOf(
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"Main-Class" to application.mainClassName
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)
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)
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}
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}

‎gradle.properties

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ktor_version=1.2.0
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kotlin.code.style=official
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kotlin_version=1.3.31
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logback_version=1.2.1
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axon_version=4.1.1
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javax_version=1

‎gradle/wrapper/gradle-wrapper.properties

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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-bin.zip
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists

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