[Solved] Connections could not be acquired from the underlying database

There has been this bug in the past two days. Record the solution and summary.


1. Driver configuration error (my bug) 

2. Database connection address error

3. Account password error

4. The database is not started or has no right to access, such as without networking 

5. The version does not correspond to (my bug) 

6. Driver jar package is not introduced into the project

My MySQL jar package is 5.0.8, but my MySQL server is 8.0, so I can change it to 5.1.46!

Mysql-connector-java-5.1.46-bin.jar download address:

Download address

We can find out the reason according to the actual situation.

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