jenkins_triggers

config.erb

root@ubuntu-precise:~/work/my_trigger# cat views/my_trigger/config.erb

<%
  f = taglib('lib/form')
  f.entry :title => 'MyTrigger', :field => 'my_trigger_text_box_entry',
	  :description => 'This is the form field for MyTrigger' do
    f.textbox :title => 'MyTriggers TextBox', :field => 'my_trigger_text_box'
  end
%>

my_trigger.rb

root@ubuntu-precise:~/work/my_trigger# cat models/my_trigger.rb 

module Jenkins
  class Plugin
    class Proxies
      class TriggerDescriptorProxy < Java.hudson.triggers.TriggerDescriptor
        include Jenkins::Model::RubyDescriptor
      end

      class TriggerProxy < Java.hudson.triggers.Trigger
        include Jenkins::Plugin::Proxies::Describable
        include Java.jenkins.ruby.Get
        include Jenkins::Plugin::Proxy

        def initialize(plugin, object)
          super plugin, object, Java.hudson.model.Item.java_class
        end
      end
    end
  end

  class Trigger
    include Jenkins::Model
    include Jenkins::Model::Describable

    describe_as   Java.hudson.triggers.Trigger
    # descriptor_is Jenkins::Plugin::Proxies::TriggerDescriptorProxy

    def initialize(item)
      @item = item
      super item
    end

    Jenkins::Plugin::Proxies.register self,
                                      Jenkins::Plugin::Proxies::TriggerProxy

  end

  class MyTrigger < Trigger
    display_name "MyTrigger"

    def initialize(attrs)
      super
    end
  end
end

stacktrace

[Winstone 2012/02/29 08:23:37] - Untrapped Error in Servlet
javax.servlet.ServletException: org.apache.commons.jelly.JellyTagException: jar:file:/root/work/jenkins-home-tmp/war/WEB-INF/lib/jenkins-core-1.447.jar!/lib/hudson/project/config-trigger.jelly:31:84: <j:invokeStatic> method for_ threw exception: org.jruby.proxy.hudson.model.Descriptor$Proxy0 cannot be cast to hudson.triggers.TriggerDescriptor
	at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:101)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:563)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)

---snip---

	at java.lang.Thread.run(Thread.java:679)

Caused by: org.apache.commons.jelly.JellyTagException: jar:file:/root/work/jenkins-home-tmp/war/WEB-INF/lib/jenkins-core-1.447.jar!/lib/hudson/project/config-trigger.jelly:31:84: <j:invokeStatic> method for_ threw exception: org.jruby.proxy.hudson.model.Descriptor$Proxy0 cannot be cast to hudson.triggers.TriggerDescriptor
	at org.apache.commons.jelly.tags.core.InvokeStaticTag.doTag(InvokeStaticTag.java:148)
	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:270)
	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
	at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:93)
	... 31 more

---snip---

Caused by: java.lang.ClassCastException: org.jruby.proxy.hudson.model.Descriptor$Proxy0 cannot be cast to hudson.triggers.TriggerDescriptor
	at hudson.triggers.Trigger.for_(Trigger.java:306)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.apache.commons.jelly.tags.core.InvokeStaticTag.doTag(InvokeStaticTag.java:125)
	... 79 more