启动Tomcat后发布项目访问出现404

Question

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:1380)
at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1032)
at com.mysql.jdbc.AbandonedConnectionCleanupThread.checkThreadContextClassLoader(AbandonedConnectionCleanupThread.java:112)
at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:79)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

问题原因是该项目已经是停止状态，可能是发布异常了。
解决方法：

1. 关闭tomcat
2. 删除webapps文件夹里面的该项目文件，包含war文件和解压后的同名项目文件夹
3. 启动tomcat
4. 把war包丢到webapps里

如果还是不能访问，就看tomcat日志文件里报什么错误，对应进行处理