How do I create and run jar files in kotlin

Question

Czar · Answer

same way you would do it in Java Kotlin compiles to ` class` files just like java does

commanderpepper · Answer

This might help <https kotlinlang org docs tutorials command line html>

Imran/Malic · Answer

I am new to this Does it work with gradle

Imran/Malic · Answer

This is my set up ``` plugins id org jetbrains kotlin jvm version 1 3 30 id application group boringworks kaas version 1 0 SNAPSHOT repositories mavenCentral dependencies implementation org jetbrains kotlin kotlin stdlib jdk8 compileKotlin kotlinOptions jvmTarget = 1 8 compileTestKotlin kotlinOptions jvmTarget = 1 8 sourceSets main kotlin srcDirs += src main kotlin org boringworks jar manifest attributes Main Class org boringworks Main from configurations compile collect it isDirectory it zipTree it archivesBaseName = kaas function mainClassName = com boringworks Main ```

Czar · Answer

Your source layout should be ``` build gradle src main kotlin org boringworks Main kt ``` then you do not need sourceSets manipulation just remove that Also you don t need the `from` part of the `jar` configuration And lastly since it is Kotlin and you re probably using package level `main` function in the `Main kt` file your ` Main Class ` value should be `org boringworks MainKt` and not `Main`

Czar · Answer

full build gradle ```plugins id org jetbrains kotlin jvm version 1 3 30 id application group boringworks kaas version 1 0 SNAPSHOT repositories jcenter dependencies implementation org jetbrains kotlin kotlin stdlib jdk8 compileKotlin kotlinOptions jvmTarget = 1 8 compileTestKotlin kotlinOptions jvmTarget = 1 8 jar manifest attributes Main Class org boringworks MainKt archivesBaseName = kaas function application mainClassName = org boringworks MainKt ```

Imran/Malic · Answer

Thank you man

Imran/Malic · Answer

< Czar> Do you have an Idea why I can t use classes from my dependencies I always get this ``` $ java jar build libs kaas function 1 0 SNAPSHOT jar Exception in thread main java lang NoClassDefFoundError arrow core Option at org boringworks MainKt main Main kt 20 at org boringworks MainKt main Main kt Caused by java lang ClassNotFoundException arrow core Option at java net URLClassLoader findClass URLClassLoader java 382 at java lang ClassLoader loadClass ClassLoader java 424 at sun misc Launcher$AppClassLoader loadClass Launcher java 349 at java lang ClassLoader loadClass ClassLoader java 357 2 more ```

Imran/Malic · Answer

I added this to my dependencies ``` compile io arrow kt arrow docs $arrow version compile io arrow kt arrow syntax $arrow version compile io arrow kt arrow typeclasses $arrow version compile io arrow kt arrow core data $arrow version compile io arrow kt arrow extras data $arrow version compile io arrow kt arrow core extensions $arrow version compile io arrow kt arrow extras extensions $arrow version kapt io arrow kt arrow meta $arrow version ```

Czar · Answer

You are not specifying class path Your jar only contains your own classes

Imran/Malic · Answer

ah

Imran/Malic · Answer

Is there a tutorial for all this I only found things for android but not for plain kotlin

Czar · Answer

Yes but I don t have any links handy It is basic JVM stuff though So Java SE official docs + gradle docs It s slower than doing tutorial but IMHO worth it

Imran/Malic · Answer

Ok Can you send me the text I need to add

Imran/Malic · Answer

joy Sorry Man I just need this to work

Imran/Malic · Answer

for now at least

Czar · Answer

My consulting services cost money slightly smiling face read the docs this is basic stuff and not kotlin related at all

Stephan Schroeder · Answer

in case you want to use the Kotlin DSL with gradle which means that the config file is now called build gradle kts it will also produce a fat jar a jar with all dependencies that s what the shadow plugin does ``` import org jetbrains kotlin gradle tasks KotlinCompile plugins kotlin jvm version 1 3 30 application id com github johnrengelman shadow version 5 0 0 application mainClassName = uk co mypath MyMainClass group = uk co mypath version = 1 0 SNAPSHOT repositories mavenCentral jcenter dependencies implementation kotlin stdlib jdk8 tasks withType lt KotlinCompile gt kotlinOptions jvmTarget = 1 8 ```