java

Spring Data unable to acquire database connection

DataAccessResourceFailureException.*Unable to acquire JDBC Connection

Fixes

1.Increase connection pool size: spring.datasource.hikari.maximum-pool-size
2.Check database server is running and accessible
3.Fix connection leaks - ensure @Transactional methods don't hold connections

spring-dataconnection-pool

Related Errors

Spring Boot bean not found in application context

NoSuchBeanDefinitionException.*No qualifying bean of type

•Add @Component/@Service/@Repository annotation to the class
•Ensure the package is scanned: check @ComponentScan or @SpringBootApplication basePackages

Spring circular dependency during bean creation

BeanCurrentlyInCreationException.*Requested bean is currently in creation

•Use @Lazy annotation on one of the circular dependencies
•Refactor to break the circular dependency with an event or interface

Spring Boot unsatisfied dependency injection

UnsatisfiedDependencyException.*Error creating bean with name

•Verify the required bean exists and is properly annotated
•Use @Qualifier to disambiguate when multiple beans of same type exist