How to resolve the error when starting Tomcat with JDBC?

When starting Tomcat, if there is an error with connecting to the database using JDBC, you can try the following solutions:

1. Verify if the database driver is correctly configured: in the lib folder of Tomcat, check if the correct version of the database driver is included. If not, you can copy the corresponding driver file to the lib folder.
2. Check the database connection configuration: In the configuration file of Tomcat (such as context.xml), verify that the database connection configuration is correct. Ensure that the URL, username, and password of the database are accurate.
3. Check if the database service has started successfully: Ensure that the database service is running and can be accessed through alternate methods, such as a command line client.
4. Check database permissions: ensure that the database user has sufficient permissions to connect to and operate the database.
5. Check network connection: If the database is located on a remote server, make sure the network connection is working properly, you can verify using the ping command or other methods.
6. Check the Tomcat logs: Review the log files of Tomcat (such as catalina.out) for more detailed error messages to pinpoint the exact issue.

If none of the above methods work, you can provide us with the specific error message so we can help you resolve the issue more accurately.