cannot connect in jruby rails for newbie using jruby-1.5.0 final and rails 2.3.3

can't connect nor db:migrate using jruby-1.5.0(final) and rails 2.3.3 on a windows XP machine here is my database.yml: development:     adapter: jdbc     driver: oracle.jdbc.driver.OracleDriver     url: jdbc:oracle:thin:@localhost:1521:monkey     username: scott     password: tiger1

C:\comics-catalog>jruby -S rake db:migrate --trace --verbose (in C:/comics-catalog) ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate rake aborted! The driver encountered an error: org.jruby.runtime.builtin.IRubyObject.setInstan ceVariable(Ljava/lang/String;Lorg/jruby/runtime/builtin/ IRubyObject;)Lorg/jruby/ runtime/builtin/IRubyObject; c:/jruby-1.5.0/lib/ruby/gems/1.8/gems/ActiveRecord-JDBC-0.5/lib/ active_record/co nnection_adapters/jdbc_adapter.rb:265:in `initialize'