Benoit Daloze

Thank you for reporting the issue. We need to look how JRuby supports that and if we can support the same or similar.

I found these docs about that feature in JRuby: https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby#reopening-java-classes https://kofno.wordpress.com/2007/02/24/monkey-patch-java-objects-from-jruby/ JRuby seems to create a Ruby Class for every Java Class (which is some memory overhead), when a Java...

As the JRuby wiki [says it](https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby#reopening-java-classes), modifications on the Ruby side are not visible to Java. And the extra methods are just stored in a Ruby class. > Perhaps behind...

OK I found the ConcurrentHashMap used for proxy classes in JRuby: https://github.com/jruby/jruby/blob/0635bb6605838c48c426db9b3cf351716eed0a16/core/src/main/java/org/jruby/util/collections/MapBasedClassValue.java https://github.com/jruby/jruby/blob/master/core/src/main/java/org/jruby/javasupport/JavaSupport.java#L113 https://github.com/jruby/jruby/blob/master/core/src/main/java/org/jruby/javasupport/Java.java#L417-L421 (this also shows there is a second ConcurrentHashMap lookup) It seems like JRuby can use ClassValue...

I will experiment with creating a Ruby Class for every foreign object which has a MetaObject (class), and see how well that works. It adds a hashmap lookup every time...

I have a very early, unoptimized, proof-of-concept for giving a Ruby class based on the foreign meta object qualified name at https://github.com/oracle/truffleruby/pull/3155 It needs more work, including a cache from...

On linux-amd64: ``` CRuby 3.1.3: $ ruby -ve "require 'bigdecimal'; p BigDecimal::VERSION; puts (BigDecimal('10.4') * 2).to_f" ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux] "3.1.1" 20.8 $ gem i bigdecimal $ ruby...

> Trying out truffleruby I encountered all the errors related to #1975. Which ones exactly? For instance https://github.com/oracle/truffleruby/issues/2002 seems very unlikely. Is it just this `puts (BigDecimal('10.4') * 2).to_f` example...

It sounds like a transient issue, probably not specific to TruffleRuby but might happen more often on TruffleRuby due to more optimizations for C extensions. Could you try on TruffleRuby...

> We think this might be an issue with the [asdf version manager](https://github.com/asdf-vm/asdf-ruby), which uses [ruby-build](https://github.com/rbenv/ruby-build) internally. > > Could that be? That's very unlikely. Maybe this is an issue...