how to inject applicationContext in bean?

[cleverswine]

Hi,

How can I inject the applicationContext? I tried

     @In
     private Context applicationContext;

but this doesn't work. Do I have to use Component.getInstance()?

[cleverswine]

p.s. I don't mean Spring's applicationContext, I mean the application scope (ServletConfig) of the application

[shane.bryzak]

The various contexts don't exist in a context themselves.  If you want a reference to the application context, simply use Contexts.getApplicationContext().

[cleverswine]

Thank you, Shane. That worked. Is there any way to inject Contexts.getApplicationContext() into my component?

[cleverswine]

Or better yet, any way to set values on the application context from components.xml? Something like:

<core:contexts scope="application" name="myProperty" value="true"/>

[shane.bryzak]

You can only inject something if it already exists in a context, or if it has a @Factory or if it's an auto-create component.  So what you could probably do if you want is create a factory method that returns the application context and annotate it with @Factory(applicationContext).  A bit of a hack, but it would work.

You can't set ad-hoc values in the application context using components.xml, only declare application-scoped components.

[matt.drees]

Bill Levitt wrote on Mar 21, 2008 08:19 PM:


I tried

     @In
     private Context applicationContext;

but this doesn't work.

Odd... that should definitely work, and works in a test case I just put together.  I'm not sure why it's not working for you.

[matt.drees]

Shane Bryzak wrote on Mar 22, 2008 06:40 AM:


You can only inject something if it already exists in a context, or if it has a @Factory or if it's an auto-create component.  So what you could probably do if you want is create a factory method that returns the application context and annotate it with @Factory(applicationContext).  A bit of a hack, but it would work.

I don't know if I'd call it a hack; there's a built in Seam component that does exactly this (org.jboss.seam.core.Contexts).  So, Bill's code should run as-is.

You can't set ad-hoc values in the application context using components.xml, only declare application-scoped components.

Well, you can do something like this, though it's slightly noisy:

<factory name="myProperty" value="#{true}" scope="application" auto-create="true"/>

[cleverswine]

It's null for me. Can you post your test case?

[cleverswine]

Hmmm... nothing is getting injected for me.

[matt.drees]

Sure.  Here it is:

package com.example.sandbox;

import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.contexts.Context;
import org.jboss.seam.log.Log;
import org.jboss.seam.mock.SeamTest;
import org.testng.Assert;
import org.testng.annotations.Test;

public class ApplicationScopeTest extends SeamTest {
     
     @Name("applicationScopeHolder")
     public static class ApplicationScopeHolder {
          @Logger Log log;
          
          @In Context applicationContext;
     
          //specified in components.xml
          @In boolean testProperty; 
          
          public void verify()
          {
               log.info("verifying applicationContext not null");
               Assert.assertNotNull(applicationContext);
               Assert.assertEquals(testProperty, true);
          }
          
     }
     
     
     @Test
     public void testApplicationScopeFactory() throws Exception
     {
          new ComponentTest() {

               @Override
               protected void testComponents() throws Exception {
                    invokeMethod("#{applicationScopeHolder.verify}");
               }
               
          }.run();
     }

}

(make sure your test src folder has a seam.properties file).

[matt.drees]

Have you been able to figure out what's going on?