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- java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [io.netty.handler.timeout.IdleStateEvent]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. at java.lang.Throwable.initCause(Throwable.java:457)[na:1.8.0_72] at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1344)