Grokking Spring Boot
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Data Sources and Connection Pools

A test of the booking service failed with this exception.

java.sql.SQLTransientConnectionException: HikariPool-2 - Connection is not available, request timed out after 1012ms (total=2, active=2, idle=0, waiting=0)

The database was running the whole time. The message says something narrower. The application had two database connections, and both were in use. A third request for a connection waited about one second and then failed, so the limit was inside the application.

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