Java中循环引用“a circular reference“的问题
a circular referenceorg.springframework.beans.factory.BeanCurrentlyInCreationException:
Error creating bean with name 'AxxxxService':
Bean with name 'BxxxxService'
has been injected into other beans in its raw version as part of a circular reference,
but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching -
consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.
1）我在远程调用的api接口中的实现类里（ReiDetailApiImpl implements ReiDetailApi 这个类中使用了 ReiDetailService.selectByAdmin(id) 方法
什么是循环引用？
循环引用指的是两个或多个对象相互依靠，导致依靠关系形成一个闭环。在依靠注入框架中，如果A对象依靠于B对象，而B对象又依靠于A对象，就形成了循环引用。 （形成一个环）
public class A {
private B b;
@Autowired
public A(B b) {
this.b = b;
}
}
public class B {
private A a;
@Autowired
public B(A a) {
this.a = a;
}
}
类A依靠于B，而类B依靠于A。这种环境会导致循环引用问题
解决循环引用
在Spring框架中，@Lazy 注解可以用来耽误加载一个bean，尤其是用来解决循环引用的问题。
通过将 @Lazy 应用于bean的注入，可以让Spring容器在创建bean时耽误对依靠的注入，从而避免在对象创建时直接解析和注入依靠，从而打破循环引用。
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;
import lombok.Data;
@Data
@Service
public class AService {
private BService bService;
@Autowired
public AService(@Lazy BService bService) {
this.bService = bService;
}
public void performAction() {
bService.doSomething();
}
}
@Data
@Service
public class BService {
private AService aService;
@Autowired
public BService(@Lazy AService aService) {
this.aService = aService;
}
public void doSomething() {
System.out.println("Doing something...");
}
}
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;
import lombok.Data;
@Data
@Service
public class AService {
private BService bService;
@Autowired
public AService(@Lazy BService bService) {
this.bService = bService;
}
public void performAction() {
bService.doSomething();
}
}
@Data
@Service
public class BService {
private AService aService;
@Autowired
public BService(@Lazy AService aService) {
this.aService = aService;
}
public void doSomething() {
System.out.println("Doing something...");
}
}
我在实际应用中
@Resource
@Lazy
private MyTestService myTestService;//注入service
@Lazy注解 用于耽误加载Bean，避免循环引用问题
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