Could not load [java.util.stream.Collectors]. The following stack trace is thrown for debugging purp

今天特别奇怪,一直报错.:然后把修改的退回去…终于定位到了

java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [java.util.stream.Collectors]. 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:1352)
	at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1340)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1205)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)