[已解决]Tomcat重新部署项目报错this web application instance has been stopped already

解决方法:

重新部署时关掉游览器中正在访问项目的页面，或者重启服务器都可以解决该问题。

 

问题分析:

当热部署Web应用程序时，可能因IDE进行热部署或者重新部署项目时，因之前在游览器中创建的线程仍在运行。但重新部署后他们的类加载器/上下文是无效的，并且由于它的原始web应用程序（以前的运行时环境）已被重新部署，因此面临非法访问异常/非法状态异常。

因此，正如此处所述，重新启动并不能永久解决此问题。所以最好实现线程池的托管。

 

原问题

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今天在写SSM项目时因为修改了一点业务代码就重新部署了下，然后就报了个错。详细错误信息如下：

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org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading 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:1355)
    at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1025)
    at com.mysql.jdbc.AbandonedConnectionCleanupThread.checkContextClassLoaders(AbandonedConnectionCleanupThread.java:90)
    at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:63)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
    at java.base/java.lang.Thread.run(Thread.java:832)

关键信息如下:

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this web application instance has been stopped already. Could not load []. 

项目环境:

IDE:IDEA 2021.3.1

服务器:Tomcat8.0.50

游览器:Microsoft Edge Bate