while spring framework is discouraging use of filed injection, and in preference of constructor injection for example. There is an issue with circular reference.
For example:
class BeanA{
@Autowired
public BeanA(BeanB beanB) {
this.beanB= beanB;
}
}
class BeanB{
@Autowired
public BeanB(BeanA beanA) {
this.beanA= beanA;
}
Field injection would otherwise work. However, with above constructor injection, spring would throw out
APPLICATION FAILED TO START
***************************
Description:
The dependencies of some of the beans in the application context form a cycle:
┌─────┐
| beanA defined in URL [jar:file:/...class]
↑ ↓
| beanB defined in URL [jar:file:/....class]
↑ ↓
| xx (field xx)
The alternative solution if must use constructor binding is to use lazy annotation
class BeanA{
@Autowired
public BeanA(@Lazy BeanB beanB) {
this.beanB= beanB;
}
}
https://github.com/spring-projects/spring-framework/issues/26703
