plugin with id spring-boot not found in parent build.gradle

Question

I have below project structure:

java/
  build.gradle
  settings.gradle
  projectA/
    build.gradle
  projectB/
    build.gradle

When I put below codes in, e.g. projectA's build.gradle,

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'spring-boot'
...

everything works fine.

But if I put the above code in Java's build.gradle:

subprojects {
    buildscript {
        repositories {
            mavenCentral()
        }
        dependencies {
            classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE")
        }
    }

    apply plugin: 'java'
    apply plugin: 'eclipse'
    apply plugin: 'spring-boot'
    ...
}

When running gradle clean build, it keeps reporting below error:

Plugin with id 'spring-boot' not found.

Anyone encountered this issue before? And why?

Answer 1

I figured out a solution but don't know why. Will spent some time reading the docs during the weekend...

Change multi-project build.gradle to below:

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
            classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE")
    }
}

subprojects {
    apply plugin: 'java'
    apply plugin: 'eclipse'
    apply plugin: 'spring-boot'
    ...
}

i.e move buildscript out of subprojects

Answer 2

Try using fully qualified name as below:

plugins{
id 'org.springframework.boot' version '2.0.3.RELEASE'
id 'java'
}