Caused by: org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'driverClassName' threw exception; nested exception is java.lang.IllegalStateException: Could not load JDBC driver class [com.mysql.jdbc.Driver]
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:122)
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:77)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1732)
... 59 more
31-May-2021 14:05:22.779 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal 一个或多个listeners启动失败，更多详细信息查看对应的容器日志文件
31-May-2021 14:05:22.899 警告 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom 使用[SHA1PRNG]创建会话ID生成的SecureRandom实例花费了[119]毫秒。
31-May-2021 14:05:22.900 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal 由于之前的错误，Context[/untitled4_war_exploded]启动失败
[2021-05-31 02:05:22,918] Artifact untitled4:war exploded: Error during artifact deployment. See server log for details.
31-May-2021 14:05:31.161 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory 把web 应用程序部署到目录 [D:\apache-tomcat-8.5.65\webapps\manager]
31-May-2021 14:05:31.208 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Web应用程序目录[D:\apache-tomcat-8.5.65\webapps\manager]的部署已在[47]毫秒内完成
看起来是“com.mysql.jdbc.Driver”这个类加载不到，应该是你没有把mysql的jar引入