Manually Load a Trigger into the Ruby Runtime

my_trigger.rb

class MyTrigger < Java.hudson.triggers.Trigger
  def initialize(descriptor)
    super()
    @descriptor = descriptor
  end
   def start(*args)
     puts "MyTrigger#start(#{args.inspect})"
   end
   def getDescriptor()
     @descriptor
   end
end


class MyTriggerDescriptor < Java.hudson.triggers.TriggerDescriptor

  def initialize
    super(Java.hudson.triggers.Trigger.java_class)

  end

  def isApplicable(item)
    true
  end

  def getDisplayName
    "My Trigger"
  end

  def getId()
    "myplugin-trigger"
  end

  def getT()
    Java.hudson.triggers.Trigger.java_class
  end

  def getConfigPage
    "/my_trigger/config"
  end

  def getGlobalConfigPage
    "/my_trigger/global"
  end

  def newInstance(request, form)
    MyTrigger.new(self)
  end

end


Jenkins::Plugin.instance.peer.addExtension MyTriggerDescriptor.new