Is jruby REXML and REXML::Document thread safe?

Question

I just wonder whether REXML library (especially REXML::Document) is thread safe in jruby?

Answer 1

It is not perfectly thread-safe: there are some class variables in the REXML classes that could be modified at any time by more than one thread (e.g., Document::entity_expansion_limit). However, most of the code is thread safe (no autoloading, for example); if you are not using those dangerous bites, you can use it without any problem.

Or you could use Nokogiri that is thread-safe by design (modulo bugs).