Project unable to find gradle shadow plugin - gradle

Question

I have a project that builds a lib. I want to make a fat jar for packaging.
I followed instructions in the gradle-shadow-plugin docs
Here is my build.gradle
buildscript {
repositories {
jcenter()
mavenCentral()
gradlePluginPortal()
maven {
url = "https://packages.confluent.io/maven"
}
}
dependencies {
classpath 'gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.1.2'
}
}
plugins {
id 'java' // so that we can use 'implementation', 'testImplementation' for dependencies
}
apply plugin: 'com.github.johnrengelman.shadow'
repositories {
jcenter()
mavenCentral()
maven {
url = "https://packages.confluent.io/maven"
}
maven {
url = "https://jitpack.io"
}
}
dependencies {
// Kafka
implementation group: 'org.apache.kafka', name: 'connect-api', version: '3.3.1'
implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.14.1'
implementation 'com.github.jcustenborder.kafka.connect:connect-utils:0.7.173'
implementation 'com.github.jcustenborder.kafka.connect:kafka-connect-transform-common:0.1.0.14'
//test
testImplementation(platform('org.junit:junit-bom:5.9.0'))
testImplementation('org.junit.jupiter:junit-jupiter')
testImplementation("io.mockk:mockk:1.9.2")
}
sourceSets {
main {
java {
srcDirs = ["src/main/java"]
}
resources {
srcDirs = ["src/main/avro", "src/main/resources"]
}
}
test {
java {
srcDirs = ["src/test/java"]
}
}
}
test {
useJUnitPlatform()
testLogging {
events "passed", "skipped", "failed"
}
}
plugins.withId("com.github.johnrengelman.shadow"){
//this block requires the java plugin to be applied first.
plugins.withId("java"){
shadowJar {
//We are overriding the default jar to be the shadow jar
classifier = null
exclude 'META-INF'
exclude 'META-INF/*.INF'
exclude 'META-INF/license/*'
}
jar {
manifest {
attributes(
'Built-By' : System.properties['user.name'],
'Build-Timestamp': new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").format(new Date()),
'Created-By' : "Gradle ${gradle.gradleVersion}",
'Build-Jdk' : "${System.properties['java.version']} (${System.properties['java.vendor']} ${System.properties['java.vm.version']})",
'Build-OS' : "${System.properties['os.name']} ${System.properties['os.arch']} ${System.properties['os.version']}"
)
}
}
tasks.build.dependsOn tasks.shadowJar
tasks.shadowJar.mustRunAfter tasks.jar
}
}
When I do a .gradlew clean build I am getting the following error.
* What went wrong:
A problem occurred configuring root project 'remove-json-value'.
> Could not resolve all files for configuration ':classpath'.
> Could not find gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.1.2.
Searched in the following locations:
- https://jcenter.bintray.com/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.1.2/shadow-7.1.2.pom
- https://repo.maven.apache.org/maven2/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.1.2/shadow-7.1.2.pom
- https://plugins.gradle.org/m2/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.1.2/shadow-7.1.2.pom
- https://packages.confluent.io/maven/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.1.2/shadow-7.1.2.pom
Required by:
project :
I search SO and found this answer. However, adding jcenter to the buildscript -> repositories section does not seem to solve it.
This is my environment:
$ ./gradlew -version
------------------------------------------------------------
Gradle 7.6
------------------------------------------------------------
Build time: 2022-11-25 13:35:10 UTC
Revision: daece9dbc5b79370cc8e4fd6fe4b2cd400e150a8
Kotlin: 1.7.10
Groovy: 3.0.13
Ant: Apache Ant(TM) version 1.10.11 compiled on July 10 2021
JVM: 1.8.0_181 (Oracle Corporation 25.181-b13)
OS: Mac OS X 10.16 x86_64
Any ideas what I am doing wrong?

Answer 1

At the time of writing this answer, the shadow plugin's latest version is 2.0.3, not 7.1.2.
Try the following:
dependencies {
classpath 'com.github.jengelman.gradle.plugins:shadow:2.0.3'
}
The 7.0.x version refers to a different "shadow" dependency, the 2.0.x belongs to the one you specified.

Answer 2

This is a bug in the current quickstart docs.
Details here
The correct classpath that works is:
classpath 'gradle.plugin.com.github.johnrengelman:shadow:7.1.2'