Problem with ActiveRecord::Base.logger

I'm using jruby and ActiveRecord in a Swing based application. Until
now I used Rails 2.3.5. Today I migrated to Rails 3 which seems to
work ok. The only problem I have is that I can no longer use the
ActiveRecord logging. Until now I used the following code to enable
logging:

ActiveRecord::Base.establish_connection(conf["mysql"])

if $global_enable_db_logging
   ActiveRecord::Base.logger = Logger.new(STDERR)
end

Any ideas how to make this work again ?

Regards
  Roger