I'm upgrading my application running on Jruby 1.4 & rails 2.3
to Rails 3.1.0 and jruby 1.6. I followed the Rails 3 upgrade Handbook by
Jeremy, and using the plugin rails\_upgrade, but when I fire the server
I'm getting errors. like

```
Routing Error
cannot load Java class com.mysentry.persistence.HibernateUtil 

```

Somebody please help me. This is the error log

```
Started GET "/admin/login/en/sentry" for 127.0.0.1 at Wed Sep 28 13:13:56 -0400
2011

ActionController::RoutingError (cannot load Java class com.mysentry.persistence.
HibernateUtil):
org/jruby/javasupport/JavaClass.java:1204:in `for_name'
org/jruby/javasupport/JavaUtilities.java:34:in `get_proxy_class'
 C:/upgrade/jruby-1.6.4/lib/ruby/site_ruby/shared/builtin/javasupport/core_ext/
 object.rb:46:in `java_import'
C:/upgrade/jruby-1.6.4/lib/ruby/site_ruby/shared/builtin/javasupport/core_ext/
object.rb:26:in `include_class'
lib/sentry/interceptor/transaction_interceptor.rb:5:in `Interceptor'
lib/sentry/interceptor/transaction_interceptor.rb:2:in `Sentry'
lib/sentry/interceptor/transaction_interceptor.rb:1:in `(root)'
 org/jruby/RubyKernel.java:1038:in `require'
polyglot (0.3.2) lib/polyglot.rb:63:in `require'
 activesupport (3.1.0) lib/active_support/dependencies.rb:240:in `require'
 activesupport (3.1.0) lib/active_support/dependencies.rb:223:in `load_dependen
cy'
activesupport (3.1.0) lib/active_support/dependencies.rb:640:in `new_constants
_in'
activesupport (3.1.0) lib/active_support/dependencies.rb:639:in `new_constants
_in'
activesupport (3.1.0) lib/active_support/dependencies.rb:223:in `load_dependen
 cy'
activesupport (3.1.0) lib/active_support/dependencies.rb:240:in `require'
lib/sentry/interceptor/transaction_interceptor.rb:7:in `Dispatcher'
lib/sentry/dispatcher/application_dispatcher.rb:3:in `Sentry'
lib/sentry/dispatcher/application_dispatcher.rb:2:in `(root)'
org/jruby/RubyKernel.java:1038:in `require'
polyglot (0.3.2) lib/polyglot.rb:63:in `require'

```