Question

I am trying to create a bean and than trying to inject the same in my Controller but i am getting bean creation failure error.Here is my code

@Service("springSecurityLoginServiceImpl")
public class SpringSecurityLoginServiceImpl implements SpringSecurityLoginService
{
  //impl
}

this is how i am trying to inject it in my controller

@Controller
@RequestMapping("springSecurity/login.json")
public class SpringSecurityLoginController
{
    @Autowired
    @Qualifier("springSecurityLoginServiceImpl")
    SpringSecurityLoginService springSecurityLoginService;

}

There is no entry in Spring-MVC-config xml file except these annotation, but when i am starting server facing the following exception

org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0'
 defined in ServletContext resource [/WEB-INF/config/spring-mvc-config.xml]: 
 Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: 
 Error creating bean with name 'springSecurityLoginController': 
 Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: 
 Could not autowire field: com.core.servicelayer.user.SpringSecurityLoginService com.storefront.controllers.pages.SpringSecurityLoginController.springSecurityLoginService; 
 nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
 No matching bean of type [com.core.servicelayer.user.SpringSecurityLoginService] 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),
 @org.springframework.beans.factory.annotation.Qualifier(value=springSecurityLoginServiceImpl)}

i am not sure what i am doing wrong or what extra i have to do

Answer 1

SpringSecurityLoginController class refers SpringSecurityLoginService class, for which a bean isn’t defined. That much the error says.

It is true, because you’ve only defined a bean for the class LoginServiceImpl, which doesn’t seem to extend SpringSecurityLoginService in any way.

Spring’s bean lookup algorithm first searches for beans of which type is, or extends, SpringSecurityLoginService. Then, it narrows the avaialble options using the Qualifier. In this case, no bean is found in the first place…

See Spring doc:

4.11.3 Fine-tuning annotation-based autowiring with qualifiers

Since autowiring by type may lead to multiple candidates, it is often
necessary to have more control over the selection process. One way to
accomplish this is with Spring’s @Qualifier annotation. This allows
for associating qualifier values with specific arguments, narrowing
the set of type matches so that a specific bean is chosen for each
argument.

You need that LoginServiceImpl will implement SpringSecurityLoginService, for instance.

EDIT

Since it was just a typo you might be not including SpringSecurityLoginService‘s package in component-scan tag, in your spring configuration file (as gkamal has already mentioned). You should have there something like:

<context:component-scan base-package="org.example"/>

where org.example should be replaced by SpringSecurityLoginService‘s package.