Unable to set pipeline.type while migrating from SCR to OSGi DS annotation

Hi @bilal_ahmad 

You are doing it wrong.

Refer this blog https://medium.com/adobetech/aem-6-4-creating-a-scheduler-using-osgi-r6-annotations-4ad0b8c6fce7

Unlike with SCR annotations, it is very clean and simple to create OSGi configurations using R6 annotations by simply using @AttributeDefinition.

If you want to create your OCD in same class then you can refer below code:

package aem.core.service;

import org.apache.sling.rewriter.Transformer;
import org.apache.sling.rewriter.TransformerFactory;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Modified;
import org.osgi.service.metatype.annotations.AttributeDefinition;
import org.osgi.service.metatype.annotations.Designate;
import org.osgi.service.metatype.annotations.ObjectClassDefinition;


@Component(service = TransformerFactory.class, immediate = true)
@Designate(ocd = LinkTransformerFactory.Config.class)
public class LinkTransformerFactory implements TransformerFactory {

    @ObjectClassDefinition(name = "LinkTransformerFactory Service", description = "LinkTransformerFactory Configuration")
    public @interface Config {

        @AttributeDefinition(name = "Pipeline Type", required = true)
        String getPipelineType() default "gatedassettransformer";
    }

    @Activate
    @Modified
    protected void activate(final Config config) {
        String pipelineType = config.getPipelineType();
    }

    @Override
    public Transformer createTransformer() {
        return null;
    }
}