End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Gem.java_platform?

java_platform?

# File tmp/rubies/ruby-3.0.5/lib/rubygems.rb, line 1025
def self.java_platform?
  RUBY_PLATFORM == "java"
end

Is this a java platform?

See also .install .latest_rubygems_version .host= .latest_spec_for also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1