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JEECG start Error "com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:Could not create connection to Database server. " The solution

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After running "Maven build" and "Tomcat:run", the following error is reported:

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)......

It's probably because you're like me. Install MySQL 8, change to MySQL 5 and try again.

JEECG start Error "com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:Could not create connection to Database server. " The solution

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