1. Jar package is not imported
2 Multiple versions conflict
3 Version mismatch between idea and Tomcat
java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1444)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1252)
Error reporting check
1. Check whether you have introduced MySQL-connector-Java.Jar package
This is used to link the database
2. Check the position of the bag
be sure to check
3. See if there are more spaces in the incoming string
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