First version of appcds generation script.

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/

Gemfile

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+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# Specify your gem's dependencies in jruby-startup.gemspec
+gemspec

README.md

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+# Jruby::Startup
+
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/jruby/startup`. To experiment with that code, run `bin/console` for an interactive prompt.
+
+TODO: Delete this and the text above, and describe your gem
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'jruby-startup'
+```
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install jruby-startup
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/headius/jruby-startup.

Rakefile

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+require "bundler/gem_tasks"
+task :default => :spec

jruby-startup.gemspec

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+
+lib = File.expand_path("../lib", __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require "jruby/startup/version"
+
+Gem::Specification.new do |spec|
+  spec.name          = "jruby-startup"
+  spec.version       = Jruby::Startup::VERSION
+  spec.authors       = ["Charles Oliver Nutter"]
+  spec.email         = ["headius@headius.com"]
+
+  spec.summary       = %q{TODO: Write a short summary, because RubyGems requires one.}
+  spec.description   = %q{TODO: Write a longer description or delete this line.}
+  spec.homepage      = "TODO: Put your gem's website or public repo URL here."
+
+  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
+  # to allow pushing to a single host or delete this section to allow pushing to any host.
+  if spec.respond_to?(:metadata)
+    spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
+
+    spec.metadata["homepage_uri"] = spec.homepage
+    spec.metadata["source_code_uri"] = "TODO: Put your gem's public repo URL here."
+    spec.metadata["changelog_uri"] = "TODO: Put your gem's CHANGELOG.md URL here."
+  else
+    raise "RubyGems 2.0 or newer is required to protect against " \
+      "public gem pushes."
+  end
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.16"
+  spec.add_development_dependency "rake", "~> 10.0"
+end

lib/jruby/startup.rb

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+require "jruby/startup/version"
+require "jruby/startup/appcds"

lib/jruby/startup/appcds.rb

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+module JRuby::Startup::AppCDS
+  def self.regenerate_archive(argv)
+    # Sanity check a few things
+    java_version = ENV_JAVA['java.specification.version']
+
+    if java_version < '11'
+      puts "*** Warning: this feature is only supported on Java 11 or higher"
+    end
+
+    # Go for it
+    command_line = argv[0] || "-e 1"
+    jruby_home = ENV_JAVA['jruby.home']
+    jruby_bin = File.join(jruby_home, 'bin')
+    jruby_lib = File.join(jruby_home, 'lib')
+    jruby_exe = File.join(jruby_bin, 'jruby')
+    jruby_list = File.join(jruby_lib, 'jruby.list')
+    jruby_jsa = File.join(jruby_lib, 'jruby.jsa')
+
+    # Force JRuby to be verified so its classes are seen by AppCDS
+    ENV['VERIFY_JRUBY'] = '1'
+
+    # Dump list of classes for this command line
+    puts "*** Outputting list of classes at #{jruby_jsa}"
+
+    fail unless system "VERIFY_JRUBY=1 JAVA_OPTS='-XX:DumpLoadedClassList=#{jruby_list}' #{jruby_exe} #{command_line}"
+
+    # Use class list to generate AppCDS archive
+    puts "*** Generating shared AppCDS archive at #{jruby_jsa}"
+
+    fail unless system "VERIFY_JRUBY=1 JAVA_OPTS='-Xshare:dump -XX:+UnlockDiagnosticVMOptions -XX:SharedClassListFile=#{jruby_list} -XX:SharedArchiveFile=#{jruby_jsa}' #{jruby_exe} #{command_line}"
+
+    # Display env vars to use for the new archive
+    puts <<~END
+    *** Success!
+
+    Set the following environment variables to use the shared archive:
+
+    VERIFY_JRUBY=1
+    JAVA_OPTS=-XX:SharedArchiveFile=#{jruby_jsa}
+    END
+  end
+end

lib/jruby/startup/version.rb

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+module JRuby
+  module Startup
+    VERSION = "0.1.0"
+  end
+end