SpringBoot循环依赖注入问题解决方案

简明扼要的说，就是——不使用基于构造函数的依赖注入。可通过下面方式解决。
1、在字段上使用@Autowired注解，让Spring决定在合适的时机注入。
2、用基于setter方法的依赖注射取代基于构造函数的依赖注入来解决循环依赖。【推荐】

基于setter方法：

/**
 * 知识库管理 服务实现类
 *
 * @author xq
 * @since 2021-11-04
 */
@Service
public class KnowledgeBaseManagerServiceImpl extends BaseServiceImpl<KnowledgeBaseManagerMapper, KnowledgeBaseManager> implements IKnowledgeBaseManagerService {
    private IRelationshipManagerService managerService;
    private IKnowledgeBaseRecycleBinService recycleBinService;
    @Autowired
    public void setManagerService(IRelationshipManagerService managerService) {
        this.managerService = managerService;
    }
    @Autowired
    public void setRecycleBinService(IKnowledgeBaseRecycleBinService recycleBinService) {
        this.recycleBinService = recycleBinService;
    }
}

/**
 * 知识库回收站管理 服务实现类
 *
 * @author xq
 * @since 2021-11-04
 */
@Service
public class KnowledgeBaseRecycleBinServiceImpl extends BaseServiceImpl<KnowledgeBaseRecycleBinMapper, KnowledgeBaseRecycleBin> implements IKnowledgeBaseRecycleBinService {
    private IKnowledgeBaseManagerService managerService;
    @Autowired
    public void setManagerService(IKnowledgeBaseManagerService managerService) {
        this.managerService = managerService;
    }
}

或使用@lazy懒加载注入Bean
示例：

/**
 * 知识库回收站管理 服务实现类
 *
 * @author xq
 * @since 2021-11-04
 */
@Service
public class KnowledgeBaseRecycleBinServiceImpl extends BaseServiceImpl<KnowledgeBaseRecycleBinMapper, KnowledgeBaseRecycleBin> implements IKnowledgeBaseRecycleBinService {
    @Autowired
    @Lazy
    private IKnowledgeBaseManagerService managerService;
    // @Autowired
    // public void setManagerService(IKnowledgeBaseManagerService managerService) {
    //     this.managerService = managerService;
    // }
}