Not able to instantiate/inject session scoped spring bean into Spring controller.

[Rajeish Mittal]

Hi,

This is regarding migration of a simple websphere flowers application to Spring MVC.

The shopping cart which is spring bean is session scoped. and is being injected into the Shopping cart controller.

The context file looks like below

<context:component-scan base-package="com.xxxxxx.xxxxx.web.controllers"></context:component-scan> <!-- Handles HTTP GET requests for by efficiently serving up static resources --> <mvc:resources location="/images/" mapping="/images/**" /> <mvc:resources location="/" mapping="/**" /> <mvc:annotation-driven /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="suffix"> <value>.jsp</value> </property> </bean>

@Repository("shopping")
@Scope(value="session")
@Transactional
public class ShoppingCartBean implements ShoppingCart

@Controller
@RequestMapping("/xxxx/shopping")
public class ShoppingController {
.
.
.
.
.
@Autowired
	protected ShoppingCart shoppingCart;

@PostConstruct
public void init(){
  this.shoppingCart=(ShoppingCart)Util.getSpringBean("shopping");

}

@RequestMapping(method=RequestMethod.POST)
public String doSomething(HttpServletRequest req, HttpServletResponse res) {

.............................
    shoppingCart = (ShoppingCart) session.getAttribute(Util.ATTR_CART);

 if(shoppingCart==null){
    shoppingCart =WebUtil.getBean("shopping");
}
}

When deployed, i get error
Error Stack Trace:
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shopping': Scope 'session' is not ac
tive for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested excep
tion is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual we
b request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and s
till receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestConte
xtListener or RequestContextFilter to expose the current request.

so googled a bit, sought suggestion from peers....
it seems there's clash of session scoped bean being injected in Singleton scoped controller.

so the solution is include the following i.e <aop:scoped-proxy/> in the context xml file.

<bean id="abc" class="com.ABC" scope="session"> <aop:scoped-proxy/> </bean>

but how do you put the same using annotation?

Help sought and appreciated!

Thanks

[Bill Gorder]

If you want to use annotations you would have to define your beans using java config.

This would be equivalent to what you did in the XML but using java config instead

@Bean
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public ABC abc() {
     return new ABC();
}

[Mark Spritzler]

Bill Gorder wrote:If you want to use annotations you would have to define your beans using java config.

This would be equivalent to what you did in the XML but using java config instead

@Bean
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public ABC abc() {
     return new ABC();
}

Um. Wouldn't @Component instead of @Bean also work?

@Component and @Scope can be on a bean class.

Mark

[Bill Gorder]

Mark,

You are of course correct, I reread my response and said 'have to' instead of 'could' I should know better than to type in absolutes With Spring there is usually several ways to solve the same problem. I guess i just got over excited for an opportunity to promote java config