Fix the “Login Pool Is Empty and Connection Creation Failed” error with 5 proven solutions for HikariCP, Spring Boot, MySQL, PostgreSQL, JDBC, and database connection pools.
Versions (resolved): Spring Boot 4.1.0 (pulls Spring Security / Authorization Server 7.1.0) / Java 25 LTS / Node 24 / Next.js 16.2.10 / React 19.2.7 Maven: use the wrapper (./mvnw) in each Spring ...
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