How to adapt OOTB ContentFragmentList sling model in another sling model

I am trying to adapt OOTB ContentFragmentList sling model as below -

@Model(adaptables = SlingHttpServletRequest.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL, resourceType = "myproject/components/slingTestModel")

public class SlingTestModel {

private static final Logger log = LoggerFactory.getLogger(SlingTestModel.class);

@Self(injectionStrategy = InjectionStrategy.REQUIRED)
SlingHttpServletRequest slingHttpServletRequest;
@PostConstruct
public void initModel() {
    log.debug("Inside sling model");
    ContentFragmentList ContentFragmentList = slingHttpServletRequest.adaptTo(ContentFragmentList.class);
    log.debug("sling model end");
}

}

it's throwing below exception -

Caused by: java.lang.ClassCastException: com.adobe.cq.wcm.core.components.internal.models.v1.contentfragment.ContentFragmentListImpl cannot be cast to com.adobe.cq.wcm.core.components.models.contentfragment.ContentFragmentList

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