ehcache报错

jfinal2.0+tomcat7+ehcache2.6.11+Linux

Linux version 2.6.18-164.el5 (mockbuild@x86-002.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46))

 Dec 18, 2015 2:47:04 PM 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$KeySet.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
 java.lang.IllegalStateException
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1566)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
     at net.sf.ehcache.store.disk.DiskStore.keySet(DiskStore.java:521)
     at net.sf.ehcache.store.disk.DiskStorageFactory$DiskExpiryTask.run(DiskStorageFactory.java:828)
     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
     at java.util.concurrent.ScheduledThreadPoolExecutor$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:745)

目前发现不影响使用。据网上资料查看，tomca6不出错。