java Spring 没有匹配的 bean 类型，预计至少有 1 个 bean
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Spring No matching bean of type, expected at least 1 bean
提问by Jaanus
Getting error
获取错误
No matching bean of type [foo.bar.service.AccountService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
my service:
我的服务：
public interface AccountService {
@Service
public class AccountServiceImpl implements AccountService {
So I should get the implementation
所以我应该得到实现
Where I am trying to get it :
我想在哪里得到它：
public class CustomAuthentication implements AuthenticationProvider {
@Autowired
private AccountService accountService;
In my other class also doing same thing, but there it works.
在我的其他班级也做同样的事情，但在那里它有效。
@Controller
public class AccountController {
@Autowired
private AccountService accountService;
When I remove the those 2 lines from my CustomAuthentication, getting no errors.
当我从我的CustomAuthentication. 中删除那两行时，没有错误。
configuration just incase:
配置只是柜面：
<context:component-scan base-package="foo.bar" />
回答by Subin Sebastian
Only a spring managed object can Autowire another component/service/repository.
只有 spring 管理的对象可以自动装配另一个组件/服务/存储库。
public class CustomAuthentication implements AuthenticationProviderneed to be spring managed
public class CustomAuthentication implements AuthenticationProvider需要春季管理
like
喜欢
@Controller
public class AccountController
Try annotating the CustomAuthenitcation with @Component
尝试使用 @Component 注释 CustomAuthentication
@Component
public class CustomAuthentication implements AuthenticationProvider
and let me know how CustomAuthentication Object is created. CustomAuthentication object should be a proxy obtained by requesting to Spring(ApplicationContext.getBean() or autowired in another bean).
并让我知道 CustomAuthentication 对象是如何创建的。CustomAuthentication 对象应该是通过请求 Spring(ApplicationContext.getBean() 或在另一个 bean 中自动装配的) 获得的代理。
UPDATE:
更新：
reason for this error is you have two config files. spring-servlet.xml and spring-security.xml. Beans defined in spring-security.xml is not able to find those in other.
此错误的原因是您有两个配置文件。spring-servlet.xml 和 spring-security.xml。spring-security.xml 中定义的 Bean 无法在其他中找到。
so you should try something like <import resource="spring-servlet.xml"/>in spring-security.xml.
所以你应该尝试像<import resource="spring-servlet.xml"/>在spring-security.xml.
回答by Sumit Desai
Please try <context:component-scan base-package="foo.bar.*" />or <context:component-scan base-package="foo.bar.service" />. I believe it would work.
请尝试<context:component-scan base-package="foo.bar.*" />或<context:component-scan base-package="foo.bar.service" />。我相信它会起作用。
回答by user3029645
you have to write on AccountServiceImpl class @Service("accountService")
你必须在 AccountServiceImpl 类 @Service("accountService") 上写
