You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: context_builder.rb
    path of file: ./repos/puma/lib/puma/minissl
    
    the code of the file until where you have to start completion: module Puma
  module MiniSSL
    class ContextBuilder
    
      def context
        ctx = MiniSSL::Context.new

        if defined?(JRUBY_VERSION)
          unless params['keystore']
            log_writer.error "Please specify the Java keystore via 'keystore='"
          end