Prevent JRuby build failure by sending to Kernel.require

Author: JonRowe

lib/rspec/support.rb

@@ -1,3 +1,5 @@
+require "rspec/support/ruby_features"
+
 module RSpec
   module Support
     # @api private
@@ -18,6 +20,11 @@ def self.define_optimized_require_for_rspec(lib, &require_relative)
         (class << self; self; end).__send__(:define_method, name) do |f|
           require_relative.call("#{lib}/#{f}")
         end
+      elsif Ruby.jruby? && !Kernel.respond_to?(:require)
+        # JRuby 9.1.17.0 has developed a regression for require
+        (class << self; self; end).__send__(:define_method, name) do |f|
+          Kernel.send(:require, "rspec/#{lib}/#{f}")
+        end
       else
         (class << self; self; end).__send__(:define_method, name) do |f|
           require "rspec/#{lib}/#{f}"
@@ -27,7 +34,6 @@ def self.define_optimized_require_for_rspec(lib, &require_relative)
 
     define_optimized_require_for_rspec(:support) { |f| require_relative(f) }
     require_rspec_support "version"
-    require_rspec_support "ruby_features"
 
     # @api private
     KERNEL_METHOD_METHOD = ::Kernel.instance_method(:method)