Share variables between build.gradle.kts and the application

Is it possible to share variables between build.gradle.kts and the main application? I would like to specify the application's name and version and few other settings only once.

There is a way using build sources. You can reference this code in your build.gradle.kts and your application, so you can define your variables there. Organizing Gradle Projects - Use buildSrc to abstract imperative logic

Example:

Project structure:

root/
├── build.gradle.kts
├── buildSrc/
│   └── src/
│       └── main/
│           └── kotlin/
│               └── Versions.kt
└── src/
    └── main/
        └── kotlin/
            └── com/
                └── example/
                    └── MyAppApplication.kt

Code:

// buildSrc/src/main/kotlin/Versions.kt
object Versions {
    const val appName = "MyAwesomeApp"
    const val appVersion = "1.0.0"
}

// build.gradle.kts
plugins {
    id("org.springframework.boot") version "3.0.0"
    kotlin("jvm") version "1.8.0"
}

group = "com.example"
version = Versions.appVersion // Using the version variable

application {
    applicationName = Versions.appName // Using the appname
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter")
    implementation(files("./buildSrc/build/libs/buildSrc.jar")) // Add the buildSrc.jar as dependency to use it in your main code. 
}

// src/main/kotlin/com/example/MyAppApplication.kt
package com.example.myapp

import Versions

@SpringBootApplication
class MyAppApplication {
    init {
        println("App Name: ${Versions.appName}, Version: ${Versions.appVersion}")
    }
}

fun main(args: Array<String>) {
    runApplication<MyAppApplication>(*args)
}

Hope this helps.