# Three constructor-injected services in a ring: what Spring Boot 4.1.1 prints when start-up fails

***************************
APPLICATION FAILED TO START
***************************

Description:

The dependencies of some of the beans in the application context form a cycle:

┌─────┐
|  notificationService defined in file [<core-beans>/target/classes/com/ankurm/corebeans/cycles/broken/NotificationService.class]
↑     ↓
|  orderService defined in file [<core-beans>/target/classes/com/ankurm/corebeans/cycles/broken/OrderService.class]
↑     ↓
|  paymentService defined in file [<core-beans>/target/classes/com/ankurm/corebeans/cycles/broken/PaymentService.class]
└─────┘


Action:

Relying upon circular references is discouraged and they are prohibited by default. Update your application to remove the dependency cycle between beans. As a last resort, it may be possible to break the cycle automatically by setting spring.main.allow-circular-references to true.