topic Re: Acquiring ApplicationContext inside ListOfValuesConstraint in Alfresco Archive

Acquiring ApplicationContext inside ListOfValuesConstraint

robertito — Tue, 11 Sep 2007 08:19:20 GMT

Hi!I was trying to add a constraint type programmatically, by extending it from ListOfValuesConstraint. I want to fill a listbox with values extracted from the alfresco repository (defined in a particular space), but when I try to acquire the ApplicationContext, it looks like it tries to initialize

Re: Acquiring ApplicationContext inside ListOfValuesConstraint

derek — Mon, 17 Sep 2007 12:01:23 GMT

Hi,

The application context is being initialized somewhere else - this depends on how you are starting the application in the first place. You cannot start it twice and if the first context initialization didn't use ApplicationContextHelper, then you can't use it either.

You will need some support to give the constraint implementation access to the context. Create a bean that is ApplicationContextAware and use that to push the context (not a specific bean) onto a static member. You can then retrieve it statically from the constraint implementation at runtime.

Regards

Re: Acquiring ApplicationContext inside ListOfValuesConstraint

jharrop — Wed, 16 Jan 2008 23:44:05 GMT

f the first context initialization didn't use ApplicationContextHelper, then you can't use it either.

Excuse me if this is too simple minded, but this implies that Alfresco doesn't use ApplicationContextHelper when starting up. Why doesn't it?

thanks

Jason

Re: Acquiring ApplicationContext inside ListOfValuesConstraint

lvs — Thu, 13 Mar 2008 17:35:02 GMT

Hi Jason,

Did you manage to do this? I am having exactly the same problem but I don't understand exactly what I should do to solve it.

Thanks
Laura

Re: Acquiring ApplicationContext inside ListOfValuesConstraint

kirin — Mon, 31 Mar 2008 12:37:47 GMT

The application context is being initialized somewhere else - this depends on how you are starting the application in the first place. You cannot start it twice and if the first context initialization didn't use ApplicationContextHelper, then you can't use it either.

I've got the same problem. And I didn't understand how to sovle it too :cry: For me it's very strange that Alfresco platform has ApplicationContextHelper class which doesn't return application context :?

Re: Acquiring ApplicationContext inside ListOfValuesConstraint

enrico_it — Mon, 23 Jun 2008 09:38:44 GMT

Create a bean that is ApplicationContextAware and use that to push the context (not a specific bean) onto a static member. You can then retrieve it statically from the constraint implementation at runtime.

I post just to say, that I have implemented this solution and it works.
I have created a ApplicationContextAware bean in this way:


public class MyApplicationContextHelper implements ApplicationContextAware {

   private static ApplicationContext applicationContext;
   
   public void setApplicationContext(ApplicationContext arg0)
         throws BeansException {
      applicationContext = arg0;
   }
   
   public static ApplicationContext getApplicationContext()
   {
      return applicationContext;
   }
   
   public static Object getBean(String beanName)
   {
      if(beanName==null||beanName.trim().length()==0)
      {
         return null;
      }
      else{
         return applicationContext.getBean(beanName);
      }
   }
}
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Spring creates an instance of this bean, and then I can access the ApplicationContext in any class doing:
ByBean myBean = (MyBean)MyApplicationContextHelper.getBean("MyBean");

Obviously, you use this way only when you don't have access to the Spring injection (in the evaluators for instance).