Springboot当@Primary遇到循环依赖

今天debug代码时&＃xff0c;遇到一个坑

public interface LoopService {void testLoop();void testInnerLoop();
}&＃64;Service
public class DefaultLoopService implements LoopService {private static final Logger log &＃61; LoggerFactory.getLogger(DefaultLoopService.class);&＃64;Overridepublic void testLoop() {log.info("DefaultLoopService");}&＃64;Overridepublic void testInnerLoop() {log.info("DefaultLoopService--testInnerLoop");}}&＃64;Service
&＃64;Primary
public class UsingLoopService implements LoopService {private static final Logger log &＃61; LoggerFactory.getLogger(UsingLoopService.class);&＃64;Autowiredprivate LoopService loopService;&＃64;Overridepublic void testLoop() {log.info("UsingLoopService");loopService.testInnerLoop();}&＃64;Overridepublic void testInnerLoop() {log.info("UsingLoopService--testInnerLoop");}
}&＃64;RestController
public class LoopController {&＃64;Autowiredprivate LoopService loopService;&＃64;GetMapping("/testLoop")public void testLoop() {loopService.testLoop();}
}


当我请求http://localhost:8080/testLoop时&＃xff0c;
期望打印
UsingLoopService : UsingLoopService
UsingLoopService : UsingLoopService–testInnerLoop

但实际却打印
UsingLoopService : UsingLoopService
UsingLoopService : DefaultLoopService–testInnerLoop

给UsingLoopService命名

&＃64;Service("usingLoopService")
&＃64;Primary
public class UsingLoopService implements LoopService {private static final Logger log &＃61; LoggerFactory.getLogger(UsingLoopService.class);&＃64;Autowired&＃64;Qualifier("usingLoopService")private LoopService loopService;&＃64;Overridepublic void testLoop() {log.info("UsingLoopService");loopService.testInnerLoop();}&＃64;Overridepublic void testInnerLoop() {log.info("UsingLoopService--testInnerLoop");}
}


这时打印符合预期
UsingLoopService : UsingLoopService
UsingLoopService : UsingLoopService–testInnerLoop

哪位大神有更好的解决方案&＃xff0c;不防写在下面评论区$\downarrow$

今天收到了spring官方的回复

the logic locates in org.springframework.beans.factory.support.DefaultListableBeanFactory&＃64;L1533//以下代码摘自spring源码
/*** Find bean instances that match the required type.* Called during autowiring for the specified bean.* &＃64;param beanName the name of the bean that is about to be wired* &＃64;param requiredType the actual type of bean to look for* (may be an array component type or collection element type)* &＃64;param descriptor the descriptor of the dependency to resolve* &＃64;return a Map of candidate names and candidate instances that match* the required type (never {&＃64;code null})* &＃64;throws BeansException in case of errors* &＃64;see #autowireByType* &＃64;see #autowireConstructor*/protected Map<String, Object> findAutowireCandidates(&＃64;Nullable String beanName, Class<?> requiredType, DependencyDescriptor descriptor) {String[] candidateNames &＃61; BeanFactoryUtils.beanNamesForTypeIncludingAncestors(this, requiredType, true, descriptor.isEager());Map<String, Object> result &＃61; CollectionUtils.newLinkedHashMap(candidateNames.length);for (Map.Entry<Class<?>, Object> classObjectEntry : this.resolvableDependencies.entrySet()) {Class<?> autowiringType &＃61; classObjectEntry.getKey();if (autowiringType.isAssignableFrom(requiredType)) {Object autowiringValue &＃61; classObjectEntry.getValue();autowiringValue &＃61; AutowireUtils.resolveAutowiringValue(autowiringValue, requiredType);if (requiredType.isInstance(autowiringValue)) {result.put(ObjectUtils.identityToString(autowiringValue), autowiringValue);break;}}}for (String candidate : candidateNames) {if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, descriptor)) {addCandidateEntry(result, candidate, descriptor, requiredType);}}if (result.isEmpty()) {boolean multiple &＃61; indicatesMultipleBeans(requiredType);// Consider fallback matches if the first pass failed to find anything...DependencyDescriptor fallbackDescriptor &＃61; descriptor.forFallbackMatch();for (String candidate : candidateNames) {if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, fallbackDescriptor) &&(!multiple || getAutowireCandidateResolver().hasQualifier(descriptor))) {addCandidateEntry(result, candidate, descriptor, requiredType);}}if (result.isEmpty() && !multiple) {// Consider self references as a final pass...// but in the case of a dependency collection, not the very same bean itself.for (String candidate : candidateNames) {if (isSelfReference(beanName, candidate) &&(!(descriptor instanceof MultiElementDescriptor) || !beanName.equals(candidate)) &&isAutowireCandidate(candidate, fallbackDescriptor)) {addCandidateEntry(result, candidate, descriptor, requiredType);}}}}return result;}