If you use HikariCP 7.1, you may omit `setConnectionTestQuery()` from your configuration. HikariCP now uses JDBC4's `Connection.isValid()` behind the scenes to validate connections. https://medium.com/@slow_tech/hikaricp-understanding-the-common-parameters-based-on-source-code-analysis-359de07cf03f#bf3b #java #jdbc #database #hikaricp #sql