我在centos7上的tomcat7上部署Grails应用程序时遇到了Exception，我无法理解或理解这个问题， 以下是堆栈跟踪， 请提前帮助我解决这个问题！
> Jul 25, 2016 2:47:53 AM org.apache.catalina.loader.WebappClassLoader
> loadClass INFO: Illegal access: this web application instance has been
> stopped already. Could not load
> net.sf.ehcache.store.disk.DiskStore$KeySet. The eventual following
> stack trace is caused by an error thrown for debugging purposes as
> well as to attempt to terminate the thread which caused the illegal
> access, and has no functional impact. java.lang.IllegalStateException
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
> at net.sf.ehcache.store.disk.DiskStore.keySet(DiskStore.java:610) at
> net.sf.ehcache.store.disk.DiskStorageFactory$DiskExpiryTask.run(DiskStorageFactory.java:817)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at
> java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:722)
>
> Jul 25, 2016 2:48:05 AM org.apache.catalina.loader.WebappClassLoader
> loadClass INFO: Illegal access: this web application instance has been
> stopped already. Could not load com.mongodb.DBApiLayerBeanInfo. The
> eventual following stack trace is caused by an error thrown for
> debugging purposes as well as to attempt to terminate the thread which
> caused the illegal access, and has no functional impact.
> java.lang.IllegalStateException