import java.util.List;

public class DevWebMetadata2 extends DevWebMetadataAdapter
{

	@Override
	public List<Class<? extends IIdentifiable>> getMetaDataIdWeb()
	{
		// TODO Auto-generated method stub
		return super.getMetaDataIdWeb();
	}

}

Type mismatch: cannot convert from List<Class<? extends IIdentifiable>> to List<Class<? extends IIdentifiable>>

public interface IIdentifiable<T extends IIdentifiable<T>> 
{

    Id<T> getId();
    // other methods

}