How to call activate method of Parent class

[Ankur_Khare]

Hi Team,

I am trying to extend OOB QRCodeGenerator servlet & here i am trying to initialize the parameters in activate method of OOB QRcodeGenerator Servlet whenever my custom servlet is called-

My Servlet-

@Component(service = Servlet.class, property = {"sling.servlet.paths=/bin/qrcode", "sling.servlet.extensions=png", "sling.servlet.methods=GET"})

@Designate(ocd = QRCodeGeneratorServlet.Configuration.class)

public class QRCodeGeneratorServlet extends QRCodeImageGenerator {

   protected void activate(Configuration config) {

        dataNameWhitelist = config.dataNameWhitelist();

    }

}

QRCodeGenerator Servlet-

@Component(metatype=true,

           label="AEM WCM QR-Code Generator Servlet",

           immediate=true)

@Service(value=Servlet.class)

@Properties( {

        @Property(name=Constants.SERVICE_DESCRIPTION,

                  value="QR Code Image Generator"),

        @Property(name="sling.servlet.paths",

                  value="/libs/wcm/mobile/qrcode",

                  propertyPrivate=true),

        @Property(name="sling.servlet.extensions",

                  value="png",

                  propertyPrivate=true),

        @Property(name="sling.servlet.methods",

                  value="GET",

                  propertyPrivate=true)

    } )

@SuppressWarnings("serial")

public class QRCodeImageGenerator extends AbstractImageServlet {

    protected void activate(ComponentContext componentContext) {

        Dictionary<String, Object> properties = componentContext.getProperties();

        dataNameWhitelist = OsgiUtil.toStringArray(properties.get(DATA_NAME_WHITELIST));

        if (externalizer != null) {

            author = externalizer.authorLink(null, "");

            publish = externalizer.publishLink(null, "");

        }

    }

}

Now here whenever i am calling my custom servlet -

These params are coming null-

        if (externalizer != null) {

            author = externalizer.authorLink(null, "");

            publish = externalizer.publishLink(null, "");

        }

author,publish & externalizer.

Is there any way by which we can initialize these params whenever my custom servlet is called?

Regards

[smacdonald2008]

Are you trying to read OSGI config values? 

[Jörg_Hoh · Accepted solution]

Please don't inherit from product servlets. The fact, that this class is exported from the bundle, is problemtic, and with updated versions it will definitely go away. Typically the servlet classes are not exported to the classpath available by you, and the fact that it's done here, is an issue.

[smacdonald2008]

Joerg is correct - you should not be using a Servlet like this.