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springboot2.4.1异常记录异常信息异常处理异常信息java.lang.NoSuchMethodError:javax.servlet.http.HttpServletRequest.getHttpServletMapping()Ljavax/servlet/http/HttpServletMapping;本来以为是springboot的bug而已，但是他就是不能自动显示欢迎页面（index.html）手动访问（/index.html）就行，这引起了我很大的好奇心。异常处理这个异常就是

Servlet异常记录异常信息：严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method createStandardContextjavax.management.RuntimeOperationsException: Exception invoking method manageApp异常原因：web.xml中配置se

异常处理异常信息：WARNING: An illegal reflective access operation has occurredWARNING: Illegal reflective access by org.dom4j.io.SAXContentHandler (file:/G:/Java/lib/dom4j-1.6.1.jar) to method com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser$Locator

MySQL8.0赋予用户权限遇到的异常异常一异常二正确语句先创建用户tom：create user tom identified by ‘abc123’；异常一ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘identified by ‘0