Build script is not downloading/installing gems needed by JRubyExec

[amimas]

Hello,

I'm relatively new to this plugin. I've been going through the documentation as well as the examples in this repository but I cannot seem to get a simple build script setup. Below is my build.gradle file, which is taken from the one of the examples in this repository that has a Gradle task for executing a ruby script, that has a dependency on a ruby gem.

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
      classpath "com.github.jruby-gradle:jruby-gradle-plugin:2.0.0"
  }
}

apply plugin: 'com.github.jruby-gradle.base'

import com.github.jrubygradle.JRubyExec

repositories {
  ruby.gems()
}

dependencies {
    /* Using the built-in `gems` configuration to describe the
     * dependencies our JRubyExec-based tasks will need
     */
    // gems "rubygems:colorize:0.7.7+"
    jrubyExec "rubygems:colorize:0.7.7+"
}

task printSomePrettyOutputPlease(type: JRubyExec) {
    description "Execute our nice local print-script.rb"
    script "${projectDir}/print-script.rb"
}

task runGradleTest {
    dependsOn printSomePrettyOutputPlease
}

When I run ./gradlew runGradleTest, I get the following error:

* What went wrong:
A problem occurred evaluating root project 'sup-zendesk-help-center'.
> Could not find method jrubyExec() for arguments [rubygems:colorize:0.7.7+] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

In the dependencies block of the Gradle script, I tried swapping the configuration from jrubyExec to gems and that produces the following error:

* What went wrong:
Execution failed for task ':printSomePrettyOutputPlease'.
> Could not resolve all files for configuration ':detachedConfiguration1'.
   > Could not find org.jruby:jruby-complete:9.2.9.0.
     Required by:
         project :

The above error goes away if I add a repository. For example:

repositories {
  ruby.gems()
  jcenter()
}

But I still can't get the ruby script executed. It comes with following error, which shows that the required gem hasn't been downloaded:

LoadError: no such file to load -- colorize
  require at org/jruby/RubyKernel.java:978
  require at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:54
   <main> at /Users/amimas/projects/jruby-gradle-test/print-script.rb:1

It's also not very clear from the documentation on when gems configurations should be used. What did I miss in the above build script?

[amimas]

After a lot of trial and error, I managed to get the example working. Here's my complete build.gradle script:

buildscript {
  repositories {
    jcenter()
  }

  dependencies {
      classpath "com.github.jruby-gradle:jruby-gradle-plugin:2.0.0"
  }
}

apply plugin: 'com.github.jruby-gradle.base'

import com.github.jrubygradle.JRubyExec

repositories {
  ruby.gems()
  jcenter()
}

dependencies {
    /* Using the built-in `gems` configuration to describe the
     * dependencies our JRubyExec-based tasks will need
     */
    gems "rubygems:colorize:0.7.7+"
}

task printSomePrettyOutputPlease(type: JRubyExec) {
    description "Execute our nice local print-script.rb"
    script "${projectDir}/print-script.rb"
}


/*
 * This task is only here for the execution fo the gradleTest
 */
task runGradleTest {
    dependsOn printSomePrettyOutputPlease
}

I'm not 100% sure, but pretty sure I had tried this but it didn't work. Not knowing what to do, I decided to look into my gradle cache, ~/.gradle/caches/modules-2/files-2.1/rubygems/ and I did see the colorize gem in there. Since it wasn't working, I decided to delete the entire rubygems directory from the gradle cache.

After that, couple of attempts and the above build script snippet worked successfully. 🤷‍♂

[headius]

Thanks for filing this and I'm sorry we never got around to helping out! I'm going to work with the owner of jruby-gradle to move this under the jruby organization, so we can help maintain and respond to requests.

It looks like this may be mostly a matter of documentation? I'm glad you were able to figure out how to make it work, but perhaps we should have more examples that help the next person.

[amimas]

Thanks for your reply. Glad to see some movement in this repo. Ultimately I couldn't use this in my use-case because of issues/bugs but I think this has a lot of potential.

[paulk-asert]

I think I am also seeing something similar to this. I was trying to add a JRuby constraint-programming example (invoked via Gradle) as per here:
https://github.com/paulk-asert/groovy-constraint-programming/tree/master/subprojects/SendMoreMoneyJRuby

The gem free SendMoreMoneyBruteForce.rb example works fine as does the PrintScript.rb (copy of print-script) colorize example (after working around #288) but the SendMoreMoneyConstraints.rb script fails with:

Exception `Gem::MissingSpecError' at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/dependency.rb:311 - Gem::MissingSpecError
Exception `LoadError' at org/jruby/RubyKernel.java:978 - no such file to load -- csp-solver
LoadError: no such file to load -- csp-solver
  require at org/jruby/RubyKernel.java:978
  require at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:54
   <main> at D:\projects\groovy-constraint-programming\subprojects\SendMoreMoneyJRuby\src\main\ruby\SendMoreMoneyConstraints.rb:15

GEM_HOME seems fine and the gems are sitting under the gradle cache and build/.gems/gems/ albeit in slightly different layouts.

/CC @ysb33r

[fadhlimaulidri]

i have try, before i get error too. but after i add jcenter() in repositories. it work as expected. this is full my build.gradle

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This is a general purpose Gradle build.
 * Learn more about Gradle by exploring our samples at https://docs.gradle.org/6.7.1/samples
 */
import com.github.jrubygradle.JRubyExec


plugins {
    id "com.github.jruby-gradle.base" version "2.1.0-alpha.2"
}

repositories {
    ruby.gems()
    jcenter()
}

dependencies {
    /* Using the built-in `gems` configuration to describe the
     * dependencies our JRubyExec-based tasks will need
     */
    gems "rubygems:colorize:0.7.7+"
}

task printSomePrettyOutputPlease(type: JRubyExec) {
    description "Execute our nice local print-script.rb"
    script "${projectDir}/print-script.rb"
}

/*
 * This task is only here for the execution of the gradleTest
 */
task runGradleTest {
    dependsOn printSomePrettyOutputPlease
}