JSON.dump raises Encoding::UndefinedConversionError #8682
Description
In RDoc test, Encoding::UndefinedConversionError occurred at JSON.dump to the IO which has been set_encoding(Encoding::UTF_8).
\xE2 seems the first byte of U+2026;HORIZONTAL ELLIPSIS (\xe2\x80\xa6), inserted because a long text is truncated.
https://github.com/ruby/rdoc/actions/runs/13721925009/job/38379134922#step:5:22
Error: test_meta_tags_for_markdwon_files_paragraph(RDocGeneratorDarkfishTest): Encoding::UndefinedConversionError: "\xE2" from ASCII-8BIT to UTF-8
org/jruby/RubyIO.java:1640:in `write'
org/jruby/RubyIO.java:1613:in `write'
json/ext/GeneratorState.java:237:in `generate'
json/ext/GeneratorState.java:141:in `generate'
/home/runner/work/rdoc/rdoc/vendor/bundle/jruby/3.1.0/gems/json-2.10.1-java/lib/json/common.rb:846:in `dump'
/home/runner/work/rdoc/rdoc/lib/rdoc/generator/json_index.rb:146:in `block in generate'
org/jruby/RubyIO.java:1198:in `open'
/home/runner/work/rdoc/rdoc/lib/rdoc/generator/json_index.rb:142:in `generate'
/home/runner/work/rdoc/rdoc/lib/rdoc/generator/darkfish.rb:233:in `generate'
/home/runner/work/rdoc/rdoc/test/rdoc/test_rdoc_generator_darkfish.rb:461:in `test_meta_tags_for_markdwon_files_paragraph'
I cannot reproduce it locally but suspect locale related conditions.
Environment Information
Provide at least:
-
JRuby version (
jruby -v) and command line (flags, JRUBY_OPTS, etc)jruby 9.4.13.0-SNAPSHOT (3.1.4) 2025-03-06 7fc571bc88 OpenJDK 64-Bit Server VM 17.0.14+7 on 17.0.14+7 +jit [x86_64-linux] -
Operating system and platform (e.g.
uname -a)GitHub Actions Ubuntu-latest and macOS-latest
-
Environment variables
Expected Behavior
- CRuby (and TruffleRuby) writes UTF-8 string as JSON successfully.
Actual Behavior
- Describe or show the actual behavior.
See above.