Fix Spring @Autowired Error

When using the @Autowired annotation for dependency injection, you may encounter the following common errors:

  1. NoSuchBeanDefinitionException: indicates that the bean definition that meets the criteria cannot be found.
  2. Ensure that the types of fields or method parameters annotated with @Autowired have corresponding bean definitions in the Spring container.
  3. Ensure that the names of fields or method parameters annotated with @Autowired match the names of the bean definitions.
  4. NoUniqueBeanDefinitionException: Indicates that multiple bean definitions matching the criteria were found.
  5. Ensure that there is only one bean definition in the Spring container for the field or method parameter annotated with @Autowired, or specify the use of a specific bean name.
  6. The @Qualifier annotation is used in conjunction with the bean name to explicitly specify which bean definition to use.
  7. UnsatisfiedDependencyException: Indicates a failure in dependency injection.
  8. Ensure that the type of fields or method parameters annotated with @Autowired matches the type in the bean definition, or find a way to perform type conversion.
  9. Make sure that the types of the fields or method parameters annotated with @Autowired have the correct dependency relationships in the Spring container.
  10. CircularDependencyException: A representation of a cyclical dependency.
  11. Try to avoid circular dependencies and design the dependencies between classes logically.
  12. Use the @Lazy annotation for lazy initialization of a bean, or use constructor injection instead of field injection.

If the above solutions do not resolve the error issue, you can provide the specific error information to determine the solution more accurately.

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