Solve the problem of unable to load authentication plugin 'caching' when idea2020 connects to MySQL 8_ sha2_ Password 'exception

solve IDEA2020 Connect MySQL8 appear unable to load authentication plugin 'caching_sha2_password’ abnormal .

1. This is my abnormal error report chart ：
   
   2. This is my pom.xml file ;
   
   It can be ruled out because pom.xml Inside mysql Connection version number and mysql Errors caused by inconsistent versions .
2. terms of settlement ：
   3.1 First, check your mysql Version number , For example, I mysql yes 8.0.19 Version of .
   
   3.2 Check your own pom.xml In the document mysql Is the version number the same as what you downloaded MySQL The version number is the same , It doesn't have to be the same , But it must not be compared with MySQL Low original number , It's better to be consistent .

3.3 Check you out Tomcat Inside lib Inside jar package , have a look mysql-connector-java-x.x.x.jar Whether it is installed with you MySQL Whether the version of is consistent . If it is inconsistent, you can delete it , Download the corresponding version from the Internet and copy it to lib Inside ; without , Please download the corresponding version from the Internet and copy it to lib Inside . The following is the reason why I have been unsuccessful in connecting to the database , After replacement , The connection is successful .

Replace with the corresponding version ：

After connecting to the database again, there is no error .