Kotlin-DSL | Migrating build logic from Groovy to Kotlin | Plugin library

You did not provide the type of publication, so you use just a basic Publication. from() is a function of MavenPublication, so you need to explicitly specify that you need a MavenPublication:

Using a JDK version that isn't 16 (I used JDK 15) should solve the problem. Also, make sure you change all of your environment variables and relaunch whatever command-line you are using.

assemble is a lifecycle task which means that it doesn’t create anything. Its role is to trigger other tasks that it depends upon and that do have some output. You can see those tasks by running your build with --console=plain.

The task that creates the Spring Boot fat jar is named bootJar. As you can see from its javadoc, it’s a customization of Gradle’s Jar and can be configured in the same way:

Looks like you're creating an extension function on KotlinBuildScript which may or may not be the issue. Regardless, there's no need for extension functions since you can just use the DSL directly.

Gradle calls the shared build logic convention plugins: https://docs.gradle.org/current/samples/sample_convention_plugins.html#compiling_convention_plugins

So your Example.kt would become kotlin-conventions.gradle.kts:

A discussion on how to setup a gradle file for AWS Services is located here:

https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/setup-project-gradle.html

This doc is for AWS for Java V2 (which Amazon recommends using). Follow that doc and you will learn how to setup a gradle file successfully,

If you want to learn about using a Spring Boot app and AWS, try following this document that walks you through building a Spring BOOT app that uses AWS SDK for Java V2. It then teaches you how to invoke various AWS Services and then how to deploy the sample app to the cloud.

Creating your first AWS Java web application

The only way I found to fix this problem is to remove incorrect dependencies before incorrect configurations got resolved. Here is a part of my build.gradle.kts:

This is an Intellij IDEA 2020.2 bug: https://youtrack.jetbrains.com/issue/KT-40683. Dependencies are unresolved in the buildSrc module, when you also have an Android module in the project.

As a possible workaround, please use IDEA 2020.1.

Maybe you should add the Kotlin standard lib to your dependencies explicitly?

The Gradle user guide for the Kotlin DSL Plugin describes it like this:

The Kotlin DSL Plugin provides a convenient way to develop Kotlin-based projects that contribute build logic. That includes buildSrc projects, included builds and Gradle plugins.

Your Spring Boot application does not contribute build logic and you probably shouldn't be using the plugin for it. If you were developing a Gradle plugin in Kotlin, then it would make more sense. And in that case you should be working against the same version of the Gradle API for the Kotlin DSL that is provided by the version you are building with, as targeting another version can be a bit tricky.

I would remove the plugin and instead be explicit about your configuration. You will need to put a few more lines in your build files, but this way the complication classpath won't be polluted by the DSL stuff that you don't need anyway.

It also means you need to hard-code the Kotlin version, but this is a good thing as you would otherwise rely on whatever happens to be included in the version of Gradle you are building with.

For example: