版本 3.7.7 ,运行tomcat 之后，多次修改代码，保存后，tomcat...
版本 3.7.7,运行tomcat 之后，多次修改代码，保存后，tomcat就会报如下错误：信息: Illegal access: this web application instance has been stopped already. Could not load . The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load . The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1325)
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1313)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1178)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139)
at net.sf.ehcache.store.compound.Segment$HashIterator.<init>(Segment.java:832)
at net.sf.ehcache.store.compound.Segment.hashIterator(Segment.java:826)
at net.sf.ehcache.store.compound.CompoundStore$HashIterator.hasNext(CompoundStore.java:810)
at net.sf.ehcache.store.compound.factories.DiskStorageFactory$DiskExpiryTask.run(DiskStorageFactory.java:690)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
看不出来，太抽象，请给重现步骤 比如说，我在一个类里面，写代码， 写了30 行，我保存一下，此时， tomcat 会重新加载的，然后，我再写50行代码， 保存，当我这样反复操作的时候，说不定哪个时候，就报上面的错了。 之前，在 3.7.6版本时，好像没有看到出现过这个问题的。
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