<ul data-eligibleForWebStory="false"><li>HikariCP can throw SQLTransientConnectionException when connections are not available due to long-running non-database logic holding the connection.</li><li>The core problem leading to timeouts in HikariCP is when all connections are in use and new queries are queued, causing exceptions when connections are not freed within the timeout window.</li><li>A recommended pattern to avoid HikariCP timeouts is to keep non-database work outside the DB connection scope, ensuring connections are released promptly.</li><li>Real-world impact includes cascading failures in high-concurrency systems due to delays in returning connections, emphasizing the need to configure pool size and timeouts appropriately.</li></ul>

Why HikariCP Throws Timeout & How to Fix It

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