Create a Groovy executable JAR with Gradle

Question

This is my gradle build script.

apply plugin: \'groovy\'

project.group = \"test.tree\"
archivesBaseName = \"tree\"
project.version = \"1.0\"
manifest.mainAt         


        

Answer 1

I would throw in a vote for the shadow gradle plugin. It is capable of building uber jars and is quite versatile and capable of things like class relocation to prevent dependency hell.

I will not get into comparing the two plugins, but I will go as far as saying that I have gravitated towards using shadow from having used application in the past because of the added features.

When I get tired of the startup times of @Grab based groovy scripts, I tend to write a gradle build file using the shadow plugin even for single file groovy scripts. An example gradle build file capable of building an uber jar of a groovy script file in the current directory. The main class name needs to correspond to the script file name:

repositories { 
  jcenter()
  mavenCentral()
}

defaultTasks = ['shadowJar']
version      = "1.0"

dependencies {
  compile "org.codehaus.groovy:groovy:2.4.7", 
          "commons-cli:commons-cli:1.2"
}

sourceSets {
  main {
    groovy {
        srcDirs = [rootDir]
    }
  }
}

project.tasks.remove jar

shadowJar {
  manifest {
    attributes 'Main-Class': 'MyGroovyScriptName'
  }

  classifier = ""
}

the uber jar will be generated in the build/libs directory.