SlingHttpServletRequest returning null when using Jackson Exporter

Hi,

Im using SlingHttpServletRequest in my sling model class with jackson exporter. But the request object is always returning null. Can anyone help me on this.

@Model(adaptables = {SlingHttpServletRequest.class,Resource.class}, resourceType = { "sample/components/content/example_comp" }, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
@3484101(name = "jackson", extensions = "json")
public class EESimWizardConfigModel {

@586265
SlingHttpServletRequest request;

@586265
private HashMap<String, String> productFamilyDetails;

public Map<String, String> getProductFamilyDetails() {
         if (request != null) {

             //then do something

         }

}