Recibí el siguiente error cuando uso Spring 3 con Quartz 2. ¿Alguien sabe el motivo?

Error

Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [org.springframework.scheduling.quartz.JobDetailBean] for bean with name 'job' defined in class path resource [beans.xml]: problem with class file or dependent class; nested exception is java.lang.IncompatibleClassChangeError: class org.springframework.scheduling.quartz.JobDetailBean has interface org.quartz.JobDetail as super class
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1253)

rchivo de configuración de @Spring:

<bean name="job" class="org.springframework.scheduling.quartz.JobDetailBean">
  <property name="jobClass" value="Example.ExampleJob"/>
  <property name="jobDataAsMap">
    <map>
      <entry key="timeout" value="5"/>
    </map>
  </property>
</bean>

<bean id="simpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean">
  <property name="jobDetail" ref="job"/>
  <property name="startDelay" value="1000"/>
  <property name="repeatInterval" value="5000"/>
</bean>

public class ExampleJob extends QuartzJobBean {

      private int timeout;

      /**
       * Setter called after the ExampleJob is instantiated
       * with the value from the JobDetailBean (5)
       */ 
      public void setTimeout(int timeout) {
        this.timeout = timeout;
      }

    @Override
    protected void executeInternal(JobExecutionContext ctx)
            throws JobExecutionException {
        *****
    }

}