Kotlin-dsl-samples: Configuration with name 'implementation' not found.

[forgo]

Expected Behavior

If I am configuring subprojects' dependencies via a filter, I expect the implementation function to work.

Current Behavior

Gradle fails to build with the following message:

Configuration with name 'implementation' not found.

This happens because of the dependencies {...} block below:

// apply the proper plugins & configuration for Spring Boot subprojects
configure(subprojects.filter { project -> isSpringBootProject(project) }) {
    val springBootVersion: String by project

    apply(plugin = "org.springframework.boot")
    apply(plugin = "io.spring.dependency-management")

    val implementation by configurations

    dependencies {

        implementation(platform("org.springframework.boot:spring-boot-dependencies:$springBootVersion"))

    }
}

Context

I am starting a multi project build from scratch. I want the root build script to control common dependencies so that I can minimize duplication in subproject build.gradle.kts files.

I am starting with a list of subproject names that should apply common Spring Boot plugins and dependencies. If the project is in that list, I want it to use the a common BOM as described in these docs:

implementation(platform(...))

[hanyahui88]

try
gradle subproject:build

[JLLeitschuh]

Try:

    dependencies {

       "implementation"(platform("org.springframework.boot:spring-boot-dependencies:$springBootVersion"))

    }

[rhidek]

Using Gradle 5.1 @JLLeitschuh solution was not working for me. I got this to work by adding the following:
subprojects{ apply(plugin = "java") }

[eskatos]

The implementation configuration is registered by the java plugin. The error reports you got make sense. Good you figured it out, closing.

[sylhare]

Somebody had the same problem on stackoverflow, and there's an example _build.gradle.kts_ that fix the issue there, leaving it here for anyone that might land on this page.