How do you resolve a circular reference in Spring?

How do you resolve a circular reference in Spring?

4. The Workarounds

1. 4.1. Redesign. When you have a circular dependency, it’s likely you have a design problem and the responsibilities are not well separated.
2. 4.2. Use @Lazy.
3. 4.3. Use Setter/Field Injection.
4. 4.4. Use @PostConstruct.
5. 4.5. Implement ApplicationContextAware and InitializingBean.

What is circular dependency in Spring boot?

Circular dependencies are the scenarios when two or more beans try to inject each other via constructor. The same problem Spring faces when it has to inject the circular dependencies via constructor. Spring throws BeanCurrentlyInCreationException in that situation.

How do I resolve BeanCurrentlyInCreationException?

For dependencies via constructor, Sprint just throw BeanCurrentlyInCreationException, to resolve this exception, set lazy-init to true for the bean which depends on others via constructor-arg way.

What is bean Autowiring in spring framework?

Autowiring feature of spring framework enables you to inject the object dependency implicitly. It internally uses setter or constructor injection. Autowiring can’t be used to inject primitive and string values. It works with reference only.

Why are circular dependencies bad?

Cyclic dependencies between components inhibit understanding, testing, and reuse (you need to understand both components to use either). This makes the system less maintainable because understanding the code is harder. Cyclic dependencies can cause unwanted side effects in a software system.

How do I initialize a Spring bean?

1 Answer

1. Reload method In the Bean. Create a method in your bean which will update/reload its properties.
2. Delete & Register Bean in Registry. You can use DefaultSingletonBeanRegistry to remove & re-register your bean.
3. @RefreshScope. Useful for refreshing bean value properties from config changes.

Is circular reference bad?

Circular references aren’t a bad thing in itself: you can use them to achieve complex calculations that are otherwise impossible to do, but first you must set them up properly. If you want to perform a calculation for which you need the last result to be a new input value for the calculation.