@Reference service always null in BundleListener class

[Jdruwe]

I am having issues trying to access a service of mine in a BundleListener. The service (LanguageService) works in different parts of my code outside of the BundleListener (for example my rest endpoints).

Activator:

public class Activator implements BundleActivator {
    @Override
    public void start(BundleContext bundleContext) throws Exception {
        bundleContext.addBundleListener(new PlatformCoreBundleListener());
    }
    ...
}

BundleListener:

@Component(immediate = true)
public class PlatformCoreBundleListener implements BundleListener {
    private static final Logger LOG = LoggerFactory.getLogger("AsAdventure");
    @Reference
    private LanguageService languageService;
    @Override
    public void bundleChanged(BundleEvent bundleEvent) {
        String symbolicName = bundleEvent.getBundle().getSymbolicName();
        if (symbolicName.equalsIgnoreCase(BundleConstants.SYMBOLIC_AEM_PLATFORM_CORE_BUNDLE)) {
            if (bundleEvent.getType() == BundleEvent.STARTED) {
                LOG.info("[PlatformCoreBundleListener]: " + BundleConstants.SYMBOLIC_AEM_PLATFORM_CORE_BUNDLE + " has started.");
            }
        }
    }
}

The languageService is always null even when I take a look at it in debug mode while the bundleEvent has a type of 'STARTED'.

What am I doing wrong? Thanks in advance!

[Feike_Visser1]

are all the bundles active?

[Jdruwe]

Yes they are.

Example of me disabling the acs commons bundle while in debug mode:

[Feike_Visser1]

Can you go into "components" of the system/console and lookup your component?

There should be the reason displayed why the service is null

[Jdruwe]

com.company.core.service.PlatformCoreBundleListener

Bundle	aem-company-platform-core-bundle (520)
Implementation Class	com.company.core.service.PlatformCoreBundleListener
Default State	enabled
Activation	immediate
Configuration Policy	optional
Services
PID	com.company.core.service.PlatformCoreBundleListener
Reference languageService	Satisfied Service Name: com.company.core.service.LanguageService Cardinality: 1..1 Policy: static Policy Option: reluctant Bound Service ID 26620 (com.company.core.service.LanguageService)
Properties	component.id = 9272 component.name = com.company.core.service.PlatformCoreBundleListener service.pid = com.company.core.service.PlatformCoreBundleListener

Everything seems to be ok here.

Btw my original use case was to provide a set of permission for the System-user.

[Jörg_Hoh · Accepted solution]

Hi,

In the Activator class you create a PlatformCoreBundleListener through the use of the constructor ("new ..."). In that case the object is not constructed by the SCR runtime, which would handle all the injections.

You should get a reference to the PlatformCoreBundleListener instead.

But:I am not sure if this works either. IIRC the bundle activator is called by the OSGI framework itself and not by instantiated by the SCR framework. And then the @Reference injections are not handled as well.

That's the reason why I hardly use Bundle activators.

regards,
Jörg

[Jdruwe]

Thanks! Explains a lot. Will need to find another method to provide the set of default permission for my system-user.