Illegal access: this web application instance has been stopped already. Could not load net.sf.ehca_could not load [net.sf.ehcache.store.disk.diskstor-优快云博客

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博客提到Web应用实例已停止，无法加载相关类，出现IllegalStateException异常。同时博主跪求解答一直报404错误的问题，不过tomcat页面正常，问题已持续两天。

Illegal access: this web application instance has been stopped already. Could not load net.sf.ehcache.store.compound.CompoundStore $K e y S e t . T h e e v e n t u a l f o l l o w i n g s t a c k t r a c e i s c a u s e d b y a n e r r o r t h r o w n f o r d e b u g g i n g p u r p o s e s a s w e l l a s t o a t t e m p t t o t e r m i n a t e t h e t h r e a d w h i c h c a u s e d t h e i l l e g a l a c c e s s, a n d h a s n o f u n c t i o n a l i m p a c t . j a v a . l a n g . I l l e g a l S t a t e E x c e p t i o n a t o r g . a p a c h e . c a t a l i n a . l o a d e r . W e b a p p C l a s s L o a d e r B a s e . l o a d C l a s s (W e b a p p C l a s s L o a d e r B a s e . j a v a : 1777) a t o r g . a p a c h e . c a t a l i n a . l o a d e r . W e b a p p C l a s s L o a d e r B a s e . l o a d C l a s s (W e b a p p C l a s s L o a d e r B a s e . j a v a : 1735) a t n e t . s f . e h c a c h e . s t o r e . c o m p o u n d . C o m p o u n d S t o r e . k e y S e t (C o m p o u n d S t o r e . j a v a : 216) a t n e t . s f . e h c a c h e . s t o r e . c o m p o u n d . f a c t o r i e s . D i s k S t o r a g e F a c t o r y$ DiskExpiryTask.run(DiskStorageFactory.java:690)
at java.util.concurrent.Executors $R u n n a b l e A d a p t e r . c a l l (E x e c u t o r s . j a v a : 471) a t j a v a . u t i l . c o n c u r r e n t . F u t u r e T a s k . r u n A n d R e s e t (F u t u r e T a s k . j a v a : 304) a t j a v a . u t i l . c o n c u r r e n t . S c h e d u l e d T h r e a d P o o l E x e c u t o r$ ScheduledFutureTask.access $301 (S c h e d u l e d T h r e a d P o o l E x e c u t o r . j a v a : 178) a t j a v a . u t i l . c o n c u r r e n t . S c h e d u l e d T h r e a d P o o l E x e c u t o r$ 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:74
跪求解答，两天了一直报404，tomcat页面没事