how to use a plugin inside a groovy plugin - gradle

Question

I am trying to migrate tasks from build.gradle to a plugin that do it.
In my build.gradle I do this:
plugins {
//id 'java'
id 'war'
//https://plugins.gradle.org/plugin/org.gretty
id 'org.gretty' version '3.0.1'
id "com.github.dkorotych.gradle-maven-exec" version "2.2.1"
}
apply plugin: 'maven'
....
....
prepareFrontEnd (type: MavenExec, dependsOn: build) {
goals 'vaadin:prepare-frontend'
}
task buildFrontEnd (type: MavenExec, dependsOn: prepareFrontEnd) {
goals 'vaadin:build-frontend'
}
Now I am moving this stuff to a plugins:
package com.github.mdre.hgvaadinplugin
import org.gradle.api.Plugin;
import org.gradle.api.Project;
//import com.github.dkorotych.gradle.maven.exec.MavenExec;
class HGVaadinPlugin implements Plugin<Project> {
#Override
void apply(Project project) {
println "Hybrid Gradle Vaaadin plugin."
project.plugins.apply('com.github.dkorotych.gradle-maven-exec')
// project.getPluginManager().apply('gradle-maven-exec-plugin')
project.task('prepareFrontEnd', type: MavenExec){
dependsOn build
doLast {
goal 'vaadin:prepare-frontend'
}
}
}
}
If I try to import the class MavenExec I get this error:
> Task :compileGroovy FAILED
startup failed:
/home/mdre/Proyectos/HGVaadinPlugin/src/main/groovy/com/github/mdre/hgvaadinplugin/HGVaadinPlugin.groovy: 5: unable to resolve class com.github.dkorotych.gradle.maven.exec.MavenExec
# line 5, column 1.
import com.github.dkorotych.gradle.maven.exec.MavenExec;
^
and if I comment the import line, I get this error in the project that use the plugin:
What went wrong:
A problem occurred evaluating root project 'VaadinFlowLab'.
Failed to apply plugin [id 'com.github.mdre.hgvaadinplugin']
No such property: MavenExec for class: com.github.mdre.hgvaadinplugin.HGVaadinPlugin
How could I do this?
Thanks.

Answer 1

Well, I fix it!
I forget to include the dependency class in the final jar. So all of I need was to add this to the build.config:
configurations {
// configuration that holds jars to include in the jar
extraLibs
}
dependencies {
....
....
//necesario para crear un fatJar
extraLibs "gradle.plugin.com.github.dkorotych.gradle.maven.exec:gradle-maven-exec-plugin:2.2.1"
configurations.compile.extendsFrom(configurations.extraLibs)
}
jar {
from {
configurations.extraLibs.collect { it.isDirectory() ? it : zipTree(it) }
}
}
and now it is working!!