Rails core - Jun 2011 - Rails 3.1 RC4 with jruby-1.6.2 and stream-renderer missing constant Fiber

I just followed the railscast http://asciicasts.com/episodes/266-http-streaming
to have streaming. calling the http://localhost:3000/users ends up
with following error:

[INFO] NameError (uninitialized constant
ActionView::StreamingTemplateRenderer::Fiber):
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
streaming_template_renderer.rb:71:in `delayed_render''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
abstract_renderer.rb:33:in `instrument''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/activesupport-3.1.0.rc4/lib/active_support/
notifications.rb:55:in `instrument''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/activesupport-3.1.0.rc4/lib/active_support/
notifications/instrumenter.rb:21:in `instrument''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/activesupport-3.1.0.rc4/lib/active_support/
notifications.rb:55:in `instrument''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
abstract_renderer.rb:33:in `instrument''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
streaming_template_renderer.rb:70:in `delayed_render''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
streaming_template_renderer.rb:56:in `render_template''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
streaming_template_renderer.rb:23:in `call''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_view/renderer/
streaming_template_renderer.rb:23:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/rack-1.3.0/lib/rack/chunked.rb:23:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_dispatch/http/
response.rb:43:in `send''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/actionpack-3.1.0.rc4/lib/action_dispatch/http/
response.rb:43:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/activerecord-3.1.0.rc4/lib/active_record/
query_cache.rb:37:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/activerecord-3.1.0.rc4/lib/active_record/
connection_adapters/abstract/connection_pool.rb:429:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/rack-1.3.0/lib/rack/lock.rb:7:in `each''
[INFO]   /home/kristian/projects/sandbox/rails3.1/rails3.1-test5/
target/rubygems/gems/rack-1.3.0/lib/rack/handler/webrick.rb:71:in
`service''

then I found in actionpack-3.1.0.rc4/lib/action_controller/metal/
streaming.rb that streaming is only supported with ruby-1.9.2 - would
it not be nicer to get such a message when I want to use streaming the
way I configured it ?

jruby in 1.9 gives a NullPointerException which looks more like a bug
in jruby.

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