@Service are constructed twice

by

In addition to @GaryF’s answer, there is a following beautiful solution for this problem (used in projects generated by Spring Roo):

myapp-config.xml

<!-- Load everything except @Controllers -->
<context:component-scan base-package="com.myapp">
    <context:exclude-filter expression="org.springframework.stereotype.Controller"
        type="annotation"/>
</context:component-scan>

myapp-servlet.xml

<!-- Load @Controllers only -->
<context:component-scan base-package="com.myapp" use-default-filters="false">
    <context:include-filter expression="org.springframework.stereotype.Controller" 
        type="annotation"/>
</context:component-scan>

EDIT:

Removing <context:component-scan> from myapp-config.xml means, that all your autodiscovered annotated beans are registered in DispatcherServlet‘s context (that is, the context loaded from myapp-servlet.xml).

However the recommended approach is to use servlet’s context for presentation-specific things (such as controllers), and use the root context (myapp-config.xml) for the core services of your application. The solution above make this approach easy.

Regarding the practical considerations, when your core services are placed in servlet’s application context, they can’t be accessed from outside the scope of that servlet, for example, from another servlets (you may need to use another servlets to implement another access technologies) or filters (such as Spring Security filters). That’s the reason for having core services in the root application context.

More Related Contents:

  1. Using JSF as view technology of Spring MVC
  2. How to avoid the “Circular view path” exception with Spring MVC test
  3. What is difference between @RequestBody and @RequestParam?
  4. Spring Hibernate – Could not obtain transaction-synchronized Session for current thread
  5. ${employee.id} from List in JSP throws java.lang.NumberFormatException: For input string: “id”
  6. What’s the difference between and in servlet?
  7. Spring boot – Not a managed type
  8. Spring 3 MVC resources and tag
  9. @Scope(“prototype”) bean scope not creating new bean
  10. When use ResponseEntity and @RestController for Spring RESTful applications
  11. Spring CORS No ‘Access-Control-Allow-Origin’ header is present
  12. Enable HAL serialization in Spring Boot for custom controller method
  13. Send datas from html to controller in Thymeleaf?
  14. Converting from String to custom Object for Spring MVC form Data binding?
  15. Spring + Web MVC: dispatcher-servlet.xml vs. applicationContext.xml (plus shared security)
  16. Can I make a custom controller mirror the formatting of Spring-Data-Rest / Spring-Hateoas generated classes?
  17. SpringServletContainerInitializer cannot be cast to javax.servlet.ServletContainerInitializer
  18. How to handle HTTP OPTIONS requests in Spring Boot?
  19. Spring MVC Annotated Controller Interface with @PathVariable
  20. Neither BindingResult nor plain target object for bean name available as request attr [duplicate]
  21. Multiple antMatchers in Spring security
  22. An Authentication object was not found in the SecurityContext – Spring 3.2.2
  23. Scope of a Spring-Controller and its instance-variables
  24. How to use with an tag?
  25. Spring: @ModelAttribute VS @RequestBody
  26. Spring-MVC: What are a “context” and “namespace”?
  27. Looking for a Simple Spring security example [closed]
  28. Spring MVC bean mapping to HTTP GET request parameters similar to @BeanParam
  29. Is it possible to invalidate a spring security session?
  30. Using both Thymeleaf and JSP

Leave a Comment