Question

I’m deploying my Rails 3 application to a Tomcat 6 server. I’ve been using warble to package my project up into a war file and so far have not had any troubles, until now. I just added a cache_sweeper to my application. When I tried hitting the application, I received the standard 500 error page.

Looking at my logs, I saw this:

org.jruby.rack.RackInitializationException: undefined method `cache_sweeper' for ApplicationController:Class

It can’t find the cache_sweeper method? Isn’t that part of Rails?

This doesn’t happen while in development mode, though in development I’m using MRI ruby and using the rails server instead.

Anyone have any ideas?!

Full error:

SEVERE: Application Error
org.jruby.rack.RackInitializationException: undefined method `cache_sweeper' for ApplicationController:Class
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/app/controllers/application_controller.rb:239:in `require'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:227:in `load_dependency'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:346:in `require_or_load'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:491:in `load_missing_constant'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:183:in `const_missing'
    from C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/gems/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:181:in `each'
     ... 39 levels...
    from file:/C:/bin/apache-tomcat-6.0.29/webapps/rails3app/WEB-INF/lib/jruby-rack-1.0.3.jar!/vendor/rack-1.2.1/rack/builder.rb:46:in `initialize'
    from <script>:2:in `new'
    from <script>:2

    at org.jruby.rack.DefaultRackApplicationFactory$4.init(DefaultRackApplicationFactory.java:184)
    at org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackApplicationFactory.java:59)
    at org.jruby.rack.PoolingRackApplicationFactory.getApplication(PoolingRackApplicationFactory.java:94)
    at org.jruby.rack.servlet.DefaultServletDispatcher.process(DefaultServletDispatcher.java:36)
    at org.jruby.rack.RackFilter.doFilter(RackFilter.java:59)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584)
    at java.lang.Thread.run(Thread.java:619)

Answer 1

For whatever reason, you have to include the module when using jruby/warble. However, this step is not necessary when using MRI and the rails server.

I added this to my ApplicationController and it worked:

class ApplicationController < ActionController::Base
  include ActionController::Caching::Sweeping if defined?(JRUBY_VERSION)
  ...
end