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There is a newer version: 9.4.12.0

# This file boots the Ruby-based parts of JRuby.

# These are loads so they don't pollute LOADED_FEATURES
load 'jruby/kernel/jruby/type.rb'
load 'jruby/kernel/signal.rb'

# Java 7 process launching support
spec_version = ENV_JAVA['java.specification.version']

unless JRuby.runtime.posix.native?
  # native POSIX uses new logic for backquote
  # GH-1148: ProcessBuilder is not available on GAE
  begin
    # Try to access ProcessBuilder; if it fails, don't define our special process logic
    java.lang.ProcessBuilder
    load 'jruby/kernel/jruby/process_manager.rb' if spec_version && spec_version >= '1.7'
  rescue Exception
    warn "ProcessBuilder unavailable; using default backtick" if $VERBOSE
    # leave old backtick logic in place
  end
end

# These are loads so they don't pollute LOADED_FEATURES
load 'jruby/kernel/kernel.rb'
load 'jruby/kernel/proc.rb'
load 'jruby/kernel/process.rb'
load 'jruby/kernel/jruby/process_util.rb'
load 'jruby/kernel/jruby/type.rb'
load 'jruby/kernel/enumerator.rb'
load 'jruby/kernel/enumerable.rb'
load 'jruby/kernel/io.rb'
load 'jruby/kernel/time.rb'
load 'jruby/kernel/gc.rb'
load 'jruby/kernel/range.rb'
load 'jruby/kernel/load_error.rb'