title: NullPointerException With Quartz & Spring
body: <p>I'm using the Spring Quartz integration, and every time I try to shut down Tomcat, the Quartz processes fail to shut down.  This is the stack trace:</p>
  
  <pre><code>Exception in thread "org.springframework.scheduling.quartz.SchedulerFactoryBean#0_QuartzSchedulerThread" 
          java.lang.NullPointerException
      at org.apache.commons.logging.LogFactory.getCachedFactory(LogFactory.java:979)
      at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:435)
      at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685)
      at org.quartz.core.QuartzSchedulerThread.getLog(QuartzSchedulerThread.java:475)
      at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:404)
  </code></pre>
  
  <p>Has anyone seem this before?</p>