昨晚上还能跑起来的SSM项目突然报这个错误，不知从何抓起，搜索发现看到很多大佬解决办法如：

原文链接：https://blog.csdn.net/TT_130616/article/details/107767330

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在网上搜了很多办法，有说刷新maven的，可是我的这个旧系统根本就没有用到maven

有说修改tomcat -》conf目录下的-》catalina.properties文件中的tomcat.util.scan.DefaultJarScanner.jarsToSkip=\参数为tomcat.util.scan.DefaultJarScanner.jarsToSkip=*.jar\的，修改之后还是为解决。甚至我重新安装了两个不同版本的tomcat来跑，未果。。

最后在idea中的file-》Project Structure中的problems中的问题点击fix按钮，全部解决，重启tomcat，解决
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还有因为sevlet设置出错而报错的原因：如

链接：idea项目启动不了，报错war exploded: Artifact is being deployed, please wait..._ancientidiot的博客-CSDN博客

Tomcat war exploded: Artifact is being deployed, please wait..._此方星河的博客-CSDN博客

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还有因为lib依赖jar包出错的问题：如链接

本文链接：启动Tomcat报Artifact is being deployed, please wait问题_蛇哥学Java的博客-CSDN博客

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但是检查设置还是未发现问题，于是我发现我的log4j的配置文件没有安装，先配上看看详细报错：

配置方式如下方设置：

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#将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
log4j.rootLogger=DEBUG,console,file#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=log.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

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经过log4j发现问题出现了

java.sql.SQLNonTransientConnectionException: Public Key Retrieval is not allowed

是这个报错，数据库的连接问题，因此8.0以上的数据库必须配置的有3个属性

useSSL=false

MySQL 8.0 以上版本不需要建立 SSL 连接的，需要显示关闭

allowPublicKeyRetrieval=true

允许客户端从服务器获取公钥。

serverTimezone=UTC

设置时区

在经过这个操作，完美的解决了我的问题Tomcat启动成功啦

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