How to get Gradle Spring dependency plugin to work?

Question

Because I'm such a newb at this, the problem is context. Their example doesn't match my build. I've installed the jar locally so it should definitely be available.

My project looks like:

    allprojects  {
        apply plugin: 'maven'
        apply plugin: "io.spring.dependency-management"

        group = 'com.wnp'
        version = '6.5.0-SNAPSHOT'
    }

    subprojects {

        apply plugin: 'java'

        sourceCompatibility = System.getProperty("java.version")
        targetCompatibility = System.getProperty("java.version")

        repositories {
            mavenLocal()
            mavenCentral()
            jcenter()         
        }

        dependencyManagement {
            imports {
                mavenBom 'org.springframework.ws:spring-ws:2.1.4.RELEASE'
                mavenBom 'org.jboss.as:jboss-as-jms-client-bom:7.5.0.Final-redhat-21'
            }

            dependencies {
                dependency "antlr:antlr:2.7.7" 
       }

    }

apply plugin: "io.spring.dependency-management"

Their project looks like:

buildscript {
  repositories {
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }
  dependencies {
    classpath "io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE"
  }
}

apply plugin: "io.spring.dependency-management"

What I'm getting from the system is :

Caused by: org.gradle.api.plugins.UnknownPluginException: Plugin with id 'io.spring.dependency-management' not found.

Clues? What does "buildscript" represent? Is that a task? I've tried putting the "dependencies" section just about everywhere. Same goes with the "apply plugin:" line. Is my dependencyManagement section in the right place? One of the things I keep seeing is "dependencies cannot be applied to closure" which is pretty unhelpful as far as error messages go.

Answer 1

What you need to do is to define a dependency for build.gradle itself that has the plugin you're looking for. It may be e.g.:

buildscript {
   repositories {
      mavenCentral()
   }

   dependencies {
      classpath 'io.spring.gradle:dependency-management-plugin:0.5.3.RELEASE'
   }
}

allprojects  {
   apply plugin: 'maven'
   apply plugin: "io.spring.dependency-management"

   group = 'com.wnp'
   version = '6.5.0-SNAPSHOT'
}

Answer 2

Take a look at the official user guide, section called "external dependencies". According to it:

If your build script needs to use external libraries, you can add them to the script's classpath in the build script itself. You do this using the buildscript() method, passing in a closure which declares the build script classpath.

In your case,a plugin is an external dependency, and you have to provide buildscript section for all the project, which need to apply this plugin.