title: JBoss and Quartz
body: <p>I'm trying to see if Quartz can solve a problem for me. But I can't get it to work. Right now I'm stuck at the following error (relevant part)</p>
  
  <pre><code>    Caused by: org.quartz.SchedulerConfigException: Unable to instantiate class load helper class: org.quartz.simpl.CascadingClassLoadHelper cannot be cast to org.quartz.spi.ClassLoadHelper [See nested exception: java.lang.ClassCastException: org.quartz.simpl.CascadingClassLoadHelper cannot be cast to org.quartz.spi.ClassLoadHelper]
      at org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:706)
      at org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:1484)
      at org.jboss.seam.async.QuartzDispatcher.initScheduler(QuartzDispatcher.java:69)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
      at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144)
      ... 73 more
  Caused by: java.lang.ClassCastException: org.quartz.simpl.CascadingClassLoadHelper cannot be cast to org.quartz.spi.ClassLoadHelper
      at org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:703)
  </code></pre>
  
  <p>I have googled and it seems to be a question that is asked a lot but I don't find any answers. I have the quartz-jars in both my webapp and ear. </p>
  
  <p>Is there anything in my configuration that can cause this problem? </p>
  
  <p>JBoss 5.1
  Quartz JBoss 2.1.6</p>