implementationClass = 'example.plugin.GreetingPlugin'
                }
            }
            publishing {
                repositories {
                    maven { url = '${mavenRepo.uri}' }
                }
            }
        """
        producer.file('src/main/java/example/plugin/GreetingPlugin.java') << pluginImplementation('<7.0')

// setting convention when registering a task from plugin
class GreetingPlugin : Plugin<Project> {
    override fun apply(project: Project) {
        project.getTasks().register<GreetingTask>("hello") {
            greeter.convention("Greeter")
        }
    }
}
// end::convention-callsites-from-plugin[]

// tag::convention-callsites-from-buildscript[]
apply<GreetingPlugin>()

tasks.withType<GreetingTask>().configureEach {

// setting convention when registering a task from plugin
class GreetingPlugin implements Plugin<Project> {
    void apply(Project project) {
        project.getTasks().register("hello", GreetingTask) {
            greeter.convention("Greeter")
        }
    }
}
// end::convention-callsites-from-plugin[]

apply plugin: GreetingPlugin

// tag::convention-callsites-from-buildscript[]

include::sample[dir="snippets/plugins/greetingPlugin/groovy",files="buildSrc/src/main/groovy/GreetingPlugin.gradle[]"]
====

The `GreetingPlugin` can now be applied in other subprojects' builds by using its ID:

====
include::sample[dir="snippets/plugins/greetingPlugin/kotlin",files="app/build.gradle.kts[tag=use-plugin]"]
include::sample[dir="snippets/plugins/greetingPlugin/groovy",files="app/build.gradle[tag=use-plugin]"]
====

----

----

In this example, `GreetingPluginExtension` is a class that represents the convention.
The message property is the convention property with a default value of 'Hello from GreetingPlugin'.

Users can override this value in their build script:

====
[.multi-language-sample]
=====
.build.gradle.kts
[source,kotlin]
----
GreetingPluginExtension {