shadowJar {
println '!!! SHADOW JAR'
baseName = 'shadow'
}

shadowJar.execute()

  jar.dependsOn shadowJar

  jar.dependsOn shadowJar

class MyJar extends Jar {}

 task myJar(type: MyJar) {
        doLast {
            println "Hello, world!"
        }
    }

myJar.setDependsOn(jar.dependsOn)

 jar.deleteAllActions()
    jar.setDependsOn([myJar])
    jar.enabled = false

task fatJar(type: Jar) {
    baseName = project.name + '-all'
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}

gradle build -i 

task FatJar(type: Jar) {
    baseName = project.name + '-all'
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}

fatJar.setDependsOn(jar.dependsOn)
    jar.deleteAllActions()
    jar.setDependsOn([fatJar])
    fatJar.enabled = false

task fatJar(type: FatJar) {
        doLast {
            println "Hello, world!"
        }
    }

fatJar (type : Jar)

gradle fatJar

jar {
  manifest {
    attributes 'Implementation-Title': 'Gradle Jar File Example',
            'Main-Class': 'com.mkyong.DateUtils'
  }
  baseName = project.name + '-all'
  from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
  with jar
}

with jar

with(sourceSpecs)	Adds the given specs as a child of this spec.