orgspringframeworkjdbcCannotGetJdbcConnectionExceptionCouldnotgetJDBCConnection;nestedexceptionisjavasqlSQLTransientConnectionExceptionHikariPool-1-Connectionisnotavailablerequesttimedoutafter5000ms

This exception is thrown by the Spring JDBC framework when it is unable to obtain a JDBC connection from the connection pool. The underlying cause of this exception is a java.sql.SQLTransientConnectionException, which indicates that a temporary network or database issue prevented the connection from being established.

In this specific case, the exception message states that the Hikari connection pool was unable to provide a connection within the specified timeout period of 5000 milliseconds. This could be due to a variety of reasons, such as a slow network, high database load, or misconfiguration of the connection pool.

To resolve this issue, you can try the following steps:

1. Check the database server's status and ensure it is running properly.
2. Verify that the database connection properties (URL, username, password) are correct.
3. Increase the connection timeout value in your connection pool configuration if needed.
4. Check the maximum number of connections allowed in the pool and increase it if necessary.
5. If you are using a cloud-based database service, make sure it is properly configured and accessible.
6. Consider monitoring the database server and connection pool to identify any potential performance bottlenecks or resource constraints.

If the issue persists, it may be helpful to consult the documentation or seek support from the Spring framework or the HikariCP connection pool library