i'm trying to use quartz to schedule jobs in grails with out using the plugin. this is the code:

1. RunMeTask.java

   package tt;

   public class RunMeTask { public void printMe() { System.out.println("Run Me ~"); }}

2. resources.groovy (under conf/spring)

   import org.springframework.scheduling.quartz.JobDetailFactoryBean;

   import org.springframework.scheduling.quartz.SchedulerFactoryBean;

   import org.springframework.scheduling.quartz.SimpleTriggerBean;

   import tt.RunMeTask

   beans = {

   runMeTask(RunMeTask){ }

   runMeJob(JobDetailFactoryBean){

   targetObject = ref('runMeTask')

   targetMethod = "printMe"

   }

   simpleTrigger(SimpleTriggerBean){

   jobDetail = ref('runMeJob')

   repeatInterval = "5000"

   startpDelay = "1000"

   }

   schedulerFactoryBean(SchedulerFactoryBean){

   jobDetails = [ref('runMeJob')]

   triggers = [ref('simpleTrigger')]

   }

   }

i get the following exception: Error Fatal error during compilation org.apache.tools.ant.BuildException: java.lang.IncompatibleClassChangeError: class org.springframework.scheduling.quartz.SimpleTriggerBean has interface org.quartz.SimpleTrigger as super class (Use --stacktrace to see the full trace)

can anyone help?