Could not create plugin of type 'UploadGradlePlugin' for custom plugin

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1

Hi,

I am new to Gradle and trying to create a new plugin. I am using Gradle 2.6 I am applying from similar solution to here:

Error message I am getting is quite generic. I really appreciate if you suggest any troubleshooting steps. I don’t really know what is wrong?

Error:

  • What went wrong:
    A problem occurred evaluating root project ‘java’.

Failed to apply plugin [id ‘org.tts’]
Could not create plugin of type ‘UploadGradlePlugin’.

My build.gradle script from consumer project:

buildscript {
    repositories {
        maven {
            url uri('../../../../repo')
        }
        mavenLocal()
    }

    dependencies {
        //Custom plugin class path. Group=com.testdependencies, artifactId=ttsclient, version=0.0.1-BUILD-SNAPSHOT 
        classpath 'com.testdependencies:ttsclient:0.0.1-BUILD-SNAPSHOT'
    }
}

apply plugin: 'org.tts'

task uploadJacocoDump(type: org.ttsgradle.UploadGradleTask) {
    println("running consumer task!")
}

build.gradle file from publisher script:

apply plugin: 'maven'

repositories {
    maven {
            url uri('../repo')
    }
	mavenLocal()
}

group = 'com.testdependencies'
version = '0.0.1-BUILD-SNAPSHOT'

sourceCompatibility = 1.8
targetCompatibility = 1.8

configurations {
    json
    compile.extendsFrom json
}

dependencies {
    json group: 'org.glassfish', name: 'javax.json', version: '1.0.4'
    compile group: 'org.jacoco', name: 'org.jacoco.core', version: '0.7.4.201502262128'
    compile group: 'org.testng', name: 'testng', version: '6.8.7'
    testCompile group: 'org.powermock', name: 'powermock-module-testng', version: '1.6.2'
    testCompile group: 'org.powermock', name: 'powermock-api-easymock', version: '1.6.2'
    testCompile group: 'org.easymock', name: 'easymock', version: '3.3.1'
    testCompile group: 'com.google.inject', name: 'guice', version: '4.0'
    compile files(gradleApi().source.findAll { it.name.startsWith("gradle") })
    compile files(gradleApi().source.findAll { it.name.startsWith("groovy") })
}

jar {
    manifest { 
        attributes "Main-Class": "org.tts.client.TestIQ",
                   "Class-Path": "javax.json-1.0.4.jar"
    }
}

task fatJar(type: Jar, dependsOn: ['createPom']) {
    group = 'build'
    description = 'Assembles a jar archive containing the main classes and all dependent classes.'
    jar.dependsOn << fatJar
    manifest { 
        attributes "Main-Class": "org.tts.client.TestIQ"
    }
    baseName = project.name + '-all'
    from (sourceSets.main.output.classesDir)
    from (configurations.json.collect {zipTree(it)})
}

test {
    useTestNG()

    jacoco {
        // Exclude all testlogic.jar packages
        excludes = [
            'com.sleepycat.*',
            'org.apache.*',
            'org.testlogic.*',
        ]
    }
}

jacocoTestReport {
    afterEvaluate {
        classDirectories = files(classDirectories.files.collect {
            fileTree(dir: it, exclude: [
                '**/testlogic.jar',
            ])
        })
    }
}

task createPom << {
    pom {
        project {
            groupId 'com.testdependencies'
            artifactId 'ttsclient'
            version "$version"
        }
    }.writeTo("build/pom.xml")
}

uploadArchives {
    repositories {
        mavenDeployer {
            repository(url: uri('../repo')) 
        }
        mavenLocal()
    }
}
2

What’s in your src/main/resources/META-INF/gradle-plugins/org.tts.properties file for the plugin project? it needs to be a fully qualified class name.

Does UploadGradlePlugin implement Plugin<Project>?

3

Thank you Sterling for your response.

org.tts.properties contents:
implementation-class=org.tts.client.ttsgradle.UploadGradlePlugin

where org.tts.client.ttsgradle is the package name that contains the class UploadGradlePlugin.

UploadGradlePlugin implements Plugin:

package org.tts.client.ttsgradle;

import org.gradle.api.Project;
import java.util.List;
import org.gradle.api.Plugin;

public class UploadGradlePlugin implements Plugin < Project > {
	
	private List<String> listOfExecs;
	
	/**
	 * Constructor
	 * @param listOfExecs
	 */
	public UploadGradlePlugin(List<String> listOfExecs)
	{
		this.listOfExecs = listOfExecs;
	}
	
	@Override
	public void apply(Project target) {
	    target.task("uploadTask");
	}
}
4

Ah, your plugin class needs to have a default constructor. Gradle handles creating instances of the plugin.

You usually do configuration on Extension (or Task) objects, not on the plugin itself.

5

Thanks a lot, Sterling. I finally get a successful build.