gradle install command stops working as soon as the shadow jar plugin is added

[shabeepk]

Shadow Version

2.0.2

Gradle Version

4.5.1

Expected Behavior

It should build and install without a problem

Actual Behavior

gradle install command stops working as soon as the shadow jar plugin is added, even though it works fine before that.

Executing task 'install'...

:compileJava NO-SOURCE
:compileGroovy NO-SOURCE
:compileScala
:processResources NO-SOURCE
:classes
:jar
:startScripts
:distTar
:distZip
:shadowJar
A problem was found with the configuration of task ':shadowJar'. Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated and is scheduled to be removed in Gradle 5.0.
 - No value has been specified for property 'mainClassName'.
:startShadowScripts
Using TaskInputs.file() with something that doesn't resolve to a File object has been deprecated and is scheduled to be removed in Gradle 5.0. Use TaskInputs.files() instead.
:shadowDistTar
:shadowDistZip
:install FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':install'.
> Could not publish configuration 'archives'
   > A POM cannot have multiple artifacts with the same type and classifier. Already have MavenArtifact my-project:zip:zip:null, trying to add MavenArtifact  my-project:zip:zip:null.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

Gradle Build Script(s)

plugins {
    id 'com.github.johnrengelman.shadow' version '2.0.2'
    id 'scala'
    id 'java'
    id 'groovy'
    id 'application'
    id 'maven'
    id 'maven-publish'
}

group = "my.company"
version = "2018.03.01"

sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8

publishing {
    publications {
        mavenJava(MavenPublication) {
            from components.java
        }
    }
    repositories {
        maven {
            url "my.company.url"
            authentication {
                awsIm(AwsImAuthentication)
            }
        }
    }
}

mainClassName = 'my.company.my.project.Main'

repositories {
    mavenLocal()
    jcenter()
    maven {
        url "my.company.url"
        authentication {
            awsIm(AwsImAuthentication)
        }
    }

}

// In this section you declare the dependencies for your production and test code
dependencies {

    testCompile group: 'junit', name: 'junit', version: '4.12'
    testCompile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.4.13'
    testCompile group: 'org.spockframework', name: 'spock-core', version: '1.1-groovy-2.4'

    testCompile group: 'org.scalatest', name: 'scalatest_2.11', version: '3.2.0-SNAP10'
    testCompile group: 'org.scalacheck', name: 'scalacheck_2.11', version: '1.13.5'

    testCompile group: 'org.apache.hadoop', name: 'hadoop-common', version: '2.7.5'
    testCompile group: 'org.apache.hadoop', name: 'hadoop-aws', version: '2.7.5'
    testCompile group: 'org.apache.spark', name: 'spark-sql_2.11', version: '2.3.0'
    testCompile group: 'org.apache.spark', name: 'spark-repl_2.11', version: '2.3.0'
    testCompile group: 'org.apache.spark', name: 'spark-hive_2.11', version: '2.3.0'
    testCompile group: 'com.databricks', name: 'spark-redshift_2.11', version: '2.0.1'

    testCompile(group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.6.5')
            {
                force = true
            }
    testCompile(group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.6.5') {
        force = true
    }
    testCompile(group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: '2.6.5') {
        force = true
    }

    //compile "org.scala-lang:scala-library:2.11+"
    //compile "org.scala-lang:scala-compiler:2.11+"

    //shadow group: 'org.apache.spark', name: 'spark-core_2.11', version: '2.3.0'
    shadow group: 'org.apache.spark', name: 'spark-sql_2.11', version: '2.3.0'
    shadow group: 'org.apache.spark', name: 'spark-repl_2.11', version: '2.3.0'
    shadow group: 'org.apache.spark', name: 'spark-hive_2.11', version: '2.3.0'
    shadow group: 'com.databricks', name: 'spark-redshift_2.11', version: '2.0.1'
    // shadow group: 'redis.clients', name: 'jedis', version: '2.9.0'
}

applicationDefaultJvmArgs = [
        "-Xms100g", "-Xmx200g",
        "-server", "-d64"
]

run {
    standardInput = System.in

    //systemProperties System.getProperties()
    //systemProperty "java.util.concurrent.ForkJoinPool.common.parallelism", "4"

    minHeapSize = "6g"
    maxHeapSize = "14g"
    //maxHeapSize = "112g"
    jvmArgs "-d64", "-server"

}

task repl(type: JavaExec) {
    main = "scala.tools.nsc.MainGenericRunner"
    classpath = sourceSets.main.runtimeClasspath
    standardInput System.in
    args '-usejavacp'
    systemProperties System.getProperties()
    minHeapSize = "1g"
    maxHeapSize = "14g"
    jvmArgs "-d64", "-server"

}

shadowJar {
    zip64 true
    mainClassName 'my.company.my.project.Main'
}

Content of Shadow JAR (jar tf <jar file> - post link to GIST if too long)

[denuno]

You need to add a classifier, the jar and the shadowJar are using the same artifactId-- this is more of a maven publish plugin thing (really just a configuration thing, but the error gives a hint about the problem).

[jnehlmeier]

@denuno Have the same issue but don't understand your solution. shadowJar uses classifier "all" by default, right?

[jnehlmeier]

workaround can be read here: #347 (comment)

[johnrengelman]

This should be fixed in the latest version(4.0.2)

[jnehlmeier]

@johnrengelman I am using 4.0.2 with Gradle 4.10.2 and still have the issue. I had to use the mentioned workaround.

[johnrengelman]

ha. I'm not reading close enough.
Somehow i didn't manage to put this into a patch release. I'll do that now.