We got this bug report in Tilt (https://gith/ub.com/rtomayko/tilt/issues/235#issuecomment-107020136) by @TobiG77. I think this is a bug in JRuby?

I can reliably reproduce this with jruby-9.0.0.0.pre2 with aws-sdk v2.0.47.

MRI (2.2.2) and jruby-1.7.19 both work fine.

irb(main):035:0> object = s3.bucket(ENV['AWS_BUCKET']).object('hello-world/hello-world.tar.gz')
=> #<Aws::S3::Object bucket_name="xyz", key="hello-world/hello-world.tar.gz">
irb(main):036:0> object.upload_file('./hello-world.tar.gz')
LocalJumpError: yield called out of block
        from org/jruby/RubyProc.java:303:in `call'
        from org/jruby/RubyYielder.java:101:in `yield'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/model/shapes.rb:252:in `block in members'
        from org/jruby/RubyArray.java:2308:in `map'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/model/shapes.rb:251:in `block in members'
        from org/jruby/RubyProc.java:303:in `call'
        from org/jruby/RubyGenerator.java:102:in `each'
        from org/jruby/RubyEnumerator.java:300:in `each'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/model/shapes.rb:282:in `index_members_by_location_name'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/model/shapes.rb:275:in `member_by_location_name'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/endpoint.rb:54:in `block in apply_path_params'
        from org/jruby/RubyString.java:2409:in `gsub'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/endpoint.rb:47:in `apply_path_params'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/endpoint.rb:38:in `build_endpoint'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/endpoint.rb:30:in `call'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/param_validation.rb:22:in `call'
... 1 levels...
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/aws-sdk-core/plugins/s3_sse_cpk.rb:18:in `call'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/param_conversion.rb:22:in `call'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/aws-sdk-core/plugins/response_paging.rb:10:in `call'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/plugins/response_target.rb:18:in `call'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/request.rb:70:in `send_request'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-core-2.0.47/lib/seahorse/client/base.rb:216:in `block in create_multipart_upload'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-resources-2.0.47/lib/aws-sdk-resources/services/s3/multipart_file_uploader.rb:42:in `initiate_upload'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-resources-2.0.47/lib/aws-sdk-resources/services/s3/multipart_file_uploader.rb:33:in `upload'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-resources-2.0.47/lib/aws-sdk-resources/services/s3/file_uploader.rb:32:in `upload'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/lib/ruby/gems/shared/gems/aws-sdk-resources-2.0.47/lib/aws-sdk-resources/services/s3/object.rb:102:in `upload_file'
        from (irb):36:in `<eval>'
        from org/jruby/RubyKernel.java:1005:in `eval'
        from org/jruby/RubyKernel.java:1315:in `loop'
        from org/jruby/RubyKernel.java:1125:in `catch'
        from org/jruby/RubyKernel.java:1125:in `catch'
        from /home/developer/.rbenv/versions/jruby-9.0.0.0.pre2/bin/irb:13:in `<top>'irb(main):037:0> 
irb(main):038:0*