Jruby and Rails 2.2.2

Ruby JRuby
1

I am starting from scratch on a series of tutorials using the latest
JRuby and Rails. I am getting the following error (or something
similar) when I invoke a rake task or run script/generate scaffold.

syntax error:ConstructorException while constructing a mapping we had
this expected a mapping or list of mappings for merging, but found
org.jvyamlb.nodes.ScalarNode
/usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:159:in
require' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/tasks/misc.rake:3 /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:incall’
/usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:in
execute' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:ineach’
/usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:in
execute' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:578:ininvoke_with_call_chain’
/usr/local/jruby-1.1.5/lib/ruby/1.8/monitor.rb:191:in mon_synchronize' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:ininvoke_with_call_chain’
/usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:588:in
invoke_prerequisites' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:ineach’
/usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in
invoke_prerequisites' /usr/local/jruby-1.1.5/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:577:ininvoke_with_call_chain’

I didn’t find anything recent although I expect it has something to do
with the latest Rails release (I think it was OK in Rail 2.1.2)

Ideas?

Pete H.

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2

On Tue, Nov 25, 2008 at 9:58 PM, Pete H. [email protected] wrote:

I am starting from scratch on a series of tutorials using the latest JRuby
and Rails. I am getting the following error (or something similar) when I
invoke a rake task or run script/generate scaffold.

syntax error:ConstructorException while constructing a mapping we had this
expected a mapping or list of mappings for merging, but found
org.jvyamlb.nodes.ScalarNode

I’m surprised to see this, which looks like an odd yaml parsing
exception. Have you started with a Rails 2.2.2 application from
scratch, or are you upgrading an existing application?

/Nick

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3

I am starting from scratch. I just did a “rails blog” command which
built the application but I had made some changes to the database.yml to
reflect the changes to the connection.

I just deleted the folder and rebuilt the application and made no
changes to the database.yml file and the app does boot now with no
errors.

Not sure what change to the database.yml was hosing things up but I am
going to try some incremental changes and see if that has an effect.

Thanks for the pointer to the yaml.

Pete