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bhavani_ikkurth
Level 2
Oct 16, 2015 2:27 AM UTC
Solved

ConfigurationManager Reference is null

import com.day.cq.wcm.webservicesupport.Configuration; import com.day.cq.wcm.webservicesupport.ConfigurationManager; @Component(immediate=true) public class Videos { private final Logger log = Logger.getLogger(Videos.class); private Configuration configuration; @Reference private ConfigurationManager cfgMgr; public void connectToService() { configuration = cfgMgr.getConfiguration("mycustomservice"); } }

 

cfgMgr is null. I wonder why is a reference variable null anyway. Are there any other methods to get it? Any help is appreciated. Thanks.

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JustinEd3Accepted solution
Adobe Employee
Oct 16, 2015 2:27 AM UTC

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

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13 replies

Adobe Employee
JustinEd3Adobe Employee
Adobe Employee
Oct 16, 2015 2:27 AM UTC

bhavani IKKURTHI wrote...

justin_at_adobe wrote...


bhavani IKKURTHI wrote...

justin_at_adobe wrote...

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

 

Well, if I access the DS instance of the class using @Reference annotation it returns null.

 

How are you getting the DS instance? Through the ScrService ?

 

I am not following you. DS instance of what? ConfigurationManager class?

 

No. The Videos class.

You are doing this:

Videos videos = new Videos(); videos.connectToService()

This is a different instance of the Videos class than the one which is managed by the Declaritive Services (DS) runtime. Only the managed instance will have the fields injected. Any other instance of this class will not.

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bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC

justin_at_adobe wrote...


bhavani IKKURTHI wrote...

justin_at_adobe wrote...

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

 

Well, if I access the DS instance of the class using @Reference annotation it returns null.

 

How are you getting the DS instance? Through the ScrService ?

 

I am not following you. DS instance of what? ConfigurationManager class?

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Adobe Employee
JustinEd3Adobe Employee
Adobe Employee
Oct 16, 2015 2:27 AM UTC

bhavani IKKURTHI wrote...

justin_at_adobe wrote...

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

 

Well, if I access the DS instance of the class using @Reference annotation it returns null.

 

How are you getting the DS instance? Through the ScrService ?

Translate
bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC

justin_at_adobe wrote...

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

 

Well, if I access the DS instance of the class using @Reference annotation it returns null.

Translate
Adobe Employee
JustinEd3Adobe EmployeeAccepted solution
Adobe Employee
Oct 16, 2015 2:27 AM UTC

The problem doesn't have anything to do with this class. It has to do with how you are accessing this class or really the instance. You are creating a new instance of this class. Instead, you should use the instance created by DS.

You should not use getServiceReference() in a DS component except for very specific needs (which this is definitely not an example of).

Translate
bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC
protected void activate(ComponentContext context) { BundleContext bundleContext = context.getBundleContext(); ServiceReference serviceReference = bundleContext.getServiceReference(ConfigurationManager.class.getName( )); ConfigurationManager cfgMgr = (ConfigurationManager) bundleContext.getService(serviceReference); }

 

 

In the above code also, I get cfgMgr as null. Sham, Can you please share the code that you have tested with?

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bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC

Do I have to add the package cq-wcm-webservice-support as an exclusive dependency to the maven pom.xml? Can you please provide me a code snippet to retrieve the service from BundleContext?

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bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC

Sham HC wrote...

It is not a bug & I can'ot reproduce the issue. Which version of AEM?  Are you seeing the configuration manager in your instance at http://localhost:4502/system/console/services

Otherway of getting is using bundlecontext getService method.

 

I am on CQ 5.5 I can see the service. 

[img]Screen Shot 2013-10-10 at 3.38.46 PM.png[/img]

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Sham_HC
Sham_HC
Level 10
Oct 16, 2015 2:27 AM UTC

It is not a bug & I can'ot reproduce the issue. Which version of AEM?  Are you seeing the configuration manager in your instance at http://localhost:4502/system/console/services

Otherway of getting is using bundlecontext getService method.

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bhavani_ikkurthAuthor
Level 2
Oct 16, 2015 2:27 AM UTC

smacdonald2008 wrote...

That is a possibility - when you inject a ConfigurationManager - it should not be null. Sham - do you think a ticket should be opened?

 

So, is there another way of getting the ConfigurationManager without using Reference annotation? Please advise.

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