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Concurrent::ScheduledTask is broken on master JRuby #4407

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kirs opened this issue Dec 22, 2016 · 4 comments
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Concurrent::ScheduledTask is broken on master JRuby #4407

kirs opened this issue Dec 22, 2016 · 4 comments
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JRuby 9.1.7.0

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@kirs
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kirs commented Dec 22, 2016

I'm running latest version of concurrent-ruby (1.0.3) and JRuby master.

require 'concurrent'
class Job
  def perform
    puts "ddd"
  end
end

job = Job.new
executor = Concurrent::ImmediateExecutor.new
Concurrent::ScheduledTask.execute(10, args: [job], executor: executor, &:perform)

The last line crashes with java.lang.NoSuchFieldError: SUPPORTS_FENCES (full stacktrace)

The same snippet works fine on jruby-9.1.6.0, so I believe there is a regression in 9.1.7 / master.

@headius
@olleolleolle
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olleolleolle commented Dec 22, 2016 •
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This commit removed SUPPORTS_FENCES: Remove unsafe block from build altogether 64b9553

And concurrent-ruby relies on that field: concurrent-ruby code using that field in its Java/JRuby extension

What's the new/preferred way forward for concurrent-ruby, now that this field is gone?

Can they use UnsafeFences.SUPPORTS_FENCES instead?

ruby-concurrency/concurrent-ruby@7b03abb This commit added the current solution to concurrent-ruby

@headius
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headius commented Dec 23, 2016

Ahh I was worried about someone using those fields or methods. I will restore and deprecate the field.

@headius headius added this to the JRuby 9.1.7.0 milestone Dec 23, 2016
@headius
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headius commented Dec 23, 2016

This should be fixed on master. Please confirm!

@kirs
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kirs commented Dec 24, 2016

Thanks for fixing it! I confirm that it works.

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@olleolleolle @headius @kirs