How to resolve the “Java exception of connection pool shut down”?

The “Java connection pool shut down” exception is usually caused by the connection pool being closed or experiencing configuration issues. The resolution is as follows:

1. Check the connection pool configuration: Ensure that the connection pool is configured correctly, such as verifying the database connection URL, username, password, etc.
2. Check the status of the connection pool: make sure the connection pool is closed, if it is closed, it needs to be reinitialized.
3. Check for connection leaks: If a connection leak occurs, meaning that the connection is not closed after its use causing depletion of connection pool resources, it can be resolved by explicitly closing the connection after its use.
4. Check the database connection: Verify if the database is running smoothly and if the network connection is working properly.
5. Check the usage of the connection pool: If the number of connections in the connection pool is too low, it may lead to exhaustion of connection pool resources, so you can increase the maximum number of connections in the connection pool appropriately.
6. Review the logs: Examine the error logs to pinpoint the specific cause of the issue for better problem solving.

If the above methods do not solve the problem, you can try using a different connection pool implementation, or utilize other features within the connection pool such as connection recovery policies or connection validation to address the issue.