org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading 非法访问：此 Web 应用程序实例已停止

Question

我得到下面提到的tomcat日志。

30-Jun-2022 09:45:37.926 INFO [Timer-0] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [META-INF/services/javax.xml.parsers.DocumentBuilderFactory]. 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 [META-INF/services/javax.xml.parsers.DocumentBuilderFactory]. 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:1384)
                at org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:984)
                at org.apache.catalina.loader.WebappClassLoaderBase.getResources(WebappClassLoaderBase.java:1085)
                at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348)
                at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
                at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
                at javax.xml.parsers.FactoryFinder$1.run(FactoryFinder.java:293)
                at java.security.AccessController.doPrivileged(Native Method)
                at javax.xml.parsers.FactoryFinder.findServiceProvider(FactoryFinder.java:289)
                at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:267)
                at javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:119)
                at java.util.prefs.XmlSupport.createPrefsDoc(XmlSupport.java:225)
                at java.util.prefs.XmlSupport.exportMap(XmlSupport.java:343)
                at java.util.prefs.FileSystemPreferences$7.run(FileSystemPreferences.java:634)
                at java.util.prefs.FileSystemPreferences$7.run(FileSystemPreferences.java:627)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.util.prefs.FileSystemPreferences.writeBackCache(FileSystemPreferences.java:626)
                at java.util.prefs.FileSystemPreferences.syncSpiPrivileged(FileSystemPreferences.java:813)
                at java.util.prefs.FileSystemPreferences.access$2300(FileSystemPreferences.java:50)
                at java.util.prefs.FileSystemPreferences$12.run(FileSystemPreferences.java:783)
                at java.util.prefs.FileSystemPreferences$12.run(FileSystemPreferences.java:781)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.util.prefs.FileSystemPreferences.syncSpi(FileSystemPreferences.java:780)
                at java.util.prefs.AbstractPreferences.sync2(AbstractPreferences.java:1338)
                at java.util.prefs.AbstractPreferences.sync2(AbstractPreferences.java:1343)
                at java.util.prefs.AbstractPreferences.sync(AbstractPreferences.java:1329)
                at java.util.prefs.FileSystemPreferences.sync(FileSystemPreferences.java:759)
                at java.util.prefs.FileSystemPreferences.flush(FileSystemPreferences.java:836)
                at java.util.prefs.FileSystemPreferences.syncWorld(FileSystemPreferences.java:476)
                at java.util.prefs.FileSystemPreferences.access$1200(FileSystemPreferences.java:50)
                at java.util.prefs.FileSystemPreferences$3.run(FileSystemPreferences.java:444)
                at java.util.TimerThread.mainLoop(Timer.java:555)
                at java.util.TimerThread.run(Timer.java:505)

我已经尝试关闭 tomcat 并重新部署我的 Spring Boot 应用程序。 但是，此日志是如此一致，以至于它每 5 秒出现一次。 如果有人知道或有任何猜测。 请解释这个错误是什么？ 以及如何解决？

Answer 1

您正在 Web 应用程序中安排TimerTask ，而不是在取消部署 Web 应用程序时取消Timer 。 使用ServletContextListener在contextDestroyed()方法中取消Timer 。