Why this gradle build script is not compiling java class? - gradle

Question

I am trying to use Cascading in my Hadoop project. I am trying to implement first example given in Enterprise Data Workflows with Cascading book. I have written java class which contains Cascading related code and I have another build.graddle file which is supposed to compile that java class and build jar file out of it.
My folder structure is as follows :
main_folder
impatient
Main.java
build.gradle
My build.gradle file looks as below :
apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'eclipse'
archivesBaseName = 'impatient'
repositories {
mavenLocal()
mavenCentral()
mavenRepo name: 'conjars', url: 'http://conjars.org/repo/'
}
ext.cascadingVersion = '2.1.0'
dependencies {
compile( group: 'cascading', name: 'cascading-core', version: cascadingVersion )
compile( group: 'cascading', name: 'cascading-hadoop', version: cascadingVersion )
}
jar {
description = "Assembles a Hadoop ready jar file"
doFirst {
into( 'lib' ) {
from configurations.compile
}
}
manifest {
attributes( "Main-Class": "impatient/Main" )
}
}
When I run gradle clean jar command from command prompt, I get build successful message. I tried to run this jar file using
hadoop jar impatient.jar <input file path> <output file path>
command but then it gives me Exception in thread "main" java.lang.ClassNotFoundException: impatient.Main exception.
So I checked contentes of jar file and found that that jar does not contain impatient/Main.class file.
Please note that I do not know anything about gradle.
Request someone to please tell me if there is anything wrong with gradle script or I am making some mistake.
Thanks !!!

Answer 1

Move your source file to
main_folder/impatient/src/main/java/Main.java
but leave build.gradle file where it is.
By default, Gradle uses src/main/java and src/test/java to look for production and test java sources (relative to root folder, which is impatient in your case)