Using gradle/clojuresq to build clojure - jar

Question

I'm trying to use gradle/Clojuresque to build clojure code, run it, and get uberjar.
I use hints from http://dev.clojure.org/display/doc/Getting+Started+with+Gradle, https://bitbucket.org/kotarak/clojuresque/wiki/Getting%20Started, and 'Could not find us.bpsm:edn-java:0.4.3' error with Gradle for Clojure (Clojuresque).
This is the grade script.
buildscript {
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
classpath "clojuresque:clojuresque:1.7.0"
}
}
apply plugin: 'clojure'
clojure.aotCompile = true
repositories {
flatDir dirs: project.file("lib/runtime")
maven { url "http://clojars.org/repo" }
}
With gradle build task, there is no error and I have a jar file, but I don't see any class file generated; I don't think the generated jar contains nothing, especially when I compared the results from manual build (Compile clojure source into class (AOT) from command line (not using lein)).
.
├── build
│   ├── libs
│   │   └── clojure.jar
│   └── tmp
│   └── jar
│   └── MANIFEST.MF
├── build.gradle
└── src
└── hello
└── core.clj
This is the core.clj
(ns hello.core
(:gen-class))
(defn -main
"This should be pretty simple."
[]
(println "Hello, World!"))
What might be wrong? Also, how to run the code and get uberjar like lein run and lein uberjar does?
I zipped the directory in https://dl.dropboxusercontent.com/u/10773282/share/2015/clojure_test.zip

Answer 1

Create the class files
The source code should be located in ./src/main/clojure as it is the default directory.
One can specify source file in gradle file, though.
sourceSets {
main {
clojure {
srcDirs = ['src']
}
}
}
The other issue was with missing dependencies:
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
compile "org.clojure:clojure:1.6.0"
}
gradle build will generate the class files.
Get the jar file
We need to set the main class for the jar file.
jar
{
manifest.attributes("Main-Class": "hello.core")
}
I'm not exactly sure if the setup is quite necessary; gradle jar will generate the jar file.
execute the jar file
This is the command to run the code:
java -cp .:<PATH>/clojure-1.6.0.jar:build/libs/clojure_test.jar hello.core
uberjar
There are three modifications needed: hints from https://github.com/DevonStrawn/Clojuresque-Boilerplate/blob/master/UberJar/build.gradle.
uberjar
{
manifest.attributes("Main-Class": "hello.core")
}
apply plugin: 'application'
uberjar.enabled = true
Execute the uberjar
Now just one jar for the execution
clojure_test> java -jar build/libs/clojure_test-standalone.jar
Hello, World!
The new build.gradle file
buildscript {
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
classpath "clojuresque:clojuresque:1.7.0"
}
}
apply plugin: 'clojure'
clojure.aotCompile = true
sourceSets {
main {
clojure {
srcDirs = ['src']
}
}
}
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
compile "org.clojure:clojure:1.7.0"
}
jar
{
manifest.attributes("Main-Class": "hello.core")
}
uberjar
{
manifest.attributes("Main-Class": "hello.core")
}
apply plugin: 'application'
uberjar.enabled = true
Shadow jar
From Opal's answer, I add the gradle script that create shadowJar. It contains the MAINFEST file that sets up the Main-Class.
buildscript {
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
jcenter()
}
dependencies {
classpath "clojuresque:clojuresque:1.7.0"
classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.0'
}
}
apply plugin: 'application'
apply plugin: 'clojure'
apply plugin: 'com.github.johnrengelman.shadow'
clojure.aotCompile = true
mainClassName = 'hello.core'
sourceSets {
main {
clojure {
srcDirs = ['src']
}
}
}
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
compile "org.clojure:clojure:1.7.0"
}
Or use these two lines of code instead of the manifest change code:
apply plugin: 'application'
mainClassName = 'hello.core'
Execute the shadow jar
Get the ubjer jar
gradle shadow
It's the same as uberjar.
clojure_test> java -jar build/libs/clojure_test-all.jar
Hello, World!
References
https://github.com/johnrengelman/shadow
Boiler plate - https://github.com/DevonStrawn/Clojuresque-Boilerplate
Building a uberjar with Gradle

Answer 2

You're missing maven central repository:
buildscript {
repositories {
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
classpath "clojuresque:clojuresque:1.7.0"
}
}
apply plugin: 'clojure'
clojure.aotCompile = true
repositories {
flatDir dirs: project.file("lib/runtime")
maven { url "http://clojars.org/repo" }
mavenCentral()
}
dependencies {
compile "org.clojure:clojure:1.6.0"
}
And you both modify gradle source sets or move hello/core.clj to src/main/clojure where gradle by default looks for sources. With these changes jar file is generated and can be run when valid cp provided - I've no clojure installed so can't check it easily.
EDIT
Here a sample project can be found that has all the changes I introduced. It also produces uber jar with shadowJar task that has clojure dependency built-in and can enables hello.core to be run with the following command:
java -cp build/libs/29015575-all.jar hello.core
EDIT2
Now the github example produces runnable jar.