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.
├── 📂 backend/ # Spring Boot Enterprise API │ ├── 📂 src/main/java/ │ │ └── 📂 com.expensetracker/ │ │ ├── 📂 config/ # Security, CORS & OpenAPI Configuration │ │ ├── 📂 controller/ # REST Endpoints ...
redis service should have password rootroot mapping port 6379 to 6379 mounting volume ./redis_data to /data postgresql service should have password rootroot mapping port 5432 to 5432 mounting volume .
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