Lock http_parser.rb gem to v0.6.x on JRuby (#8943)

since newer versions of the gem do not have a Java counterpart

Gemfile

@@ -37,7 +37,12 @@ group :test do
   gem "test-theme-skinny", :path => File.expand_path("test/fixtures/test-theme-skinny", __dir__)
   gem "test-theme-symlink", :path => File.expand_path("test/fixtures/test-theme-symlink", __dir__)
 
-  gem "jruby-openssl", "0.10.1" if RUBY_ENGINE == "jruby"
+  # http_parser.rb has stopped shipping jruby-compatible versions
+  # latest compatible one was 0.6.0 https://rubygems.org/gems/http_parser.rb
+  if RUBY_ENGINE == "jruby"
+    gem "http_parser.rb", "~> 0.6.0"
+    gem "jruby-openssl"
+  end
 end
 
 #

lib/jekyll/commands/new.rb

@@ -101,6 +101,9 @@ def gemfile_contents
 # kramdown v1, comment out this line.
 gem "kramdown-parser-gfm"
 
+# Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
+# do not have a Java counterpart.
+gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
 RUBY
         end