Unable to call sling model class from servlet

Question

I am trying to call one of the sling model methods from servlet but I could not adapt the resource object to the sling model.  Here is my sling model.  @Model(
        adaptables = { SlingHttpServletRequest.class, Resource.class },
        adapters = ProductDetail.class,
        resourceType = ProductDetailImpl.RESOURCE_TYPE)
@Exporter(
        name = CommonConstants.JACKSON,
        extensions = CommonConstants.JSON,
        options = { @ExporterOption(
                name = CommonConstants.SERIALIZATION_FEATURE + "." + CommonConstants.WRAP_ROOT_VALUE,
                value = CommonConstants.TRUE) })

public class ProductDetailImpl implements ProductDetail
{
        @JsonProperty("productDetail")
	@Override
	public String getProductDetail() {
		return productDetail;
	}
}  I am trying to call the getEventBeanList method in my below servlet, I can see the valid Resource object and when I try to adaptTo this resource to sling model class I get a null pointer exception. Any ideas why I am getting NPE? [UPDATE]I tried to check the status using http://localhost:4502/system/console/adapters. Interestingly my sling model class is marked as red but there is no reason given. In fact the sling model works as expected individually but I am not sure why this is marked in red color. Moreover all working sling models are marked as red but it is working as expected.     protected void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response)
throws ServletException, IOException {
Resource resource = request.getResourceResolver().getResource("/content/actualcontent");
LOGGER.info("test 1--- "+resource.getResourceType());  //platform/component/content/produtdetail
boolean isValidResource = resource.isResourceType("platform/component/content/produtdetail");
LOGGER.info("test 2-- "+ isValidResource);
if(isValidResource && "platform/component/content/produtdetail".equalsIgnoreCase(resource.getResourceType())) {
        ProductDetailImpl product = resource.adaptTo(ProductDetailImpl.class);
        String  productDetail = product.getProductDetail();
        LOGGER.info("productDetail: " +productDetail);
}

}

EstebanBustamante · Accepted Answer

sorry, I got you now. yeah I checked the resource type using resource.getResourceType() and cross checked the same on crxde and sling model on @Model annotation class. All the have the same value which is "platform/component/content/produtdetail". the below IF condition is getting passed but getting NPE while adapting resource with sling model class.

Resource resource = request.getResourceResolver().getResource("/content/actualcontent");
LOGGER.info("test 1--- "+resource.getResourceType());  //platform/component/content/produtdetail
boolean isValidResource = resource.isResourceType("platform/component/content/produtdetail");
LOGGER.info("test 2-- "+ isValidResource);
if(isValidResource && "platform/component/content/produtdetail".equalsIgnoreCase(resource.getResourceType())) {
        ProductDetailImpl product = resource.adaptTo(ProductDetailImpl.class);
        String  productDetail = product.getProductDetail();
        LOGGER.info("productDetail: " +productDetail);
}

I tried to check the status using http://localhost:4502/system/console/adapters. Interestingly my sling model class is marked as red but there is no reason given. In fact the sling model works as expected individually but I am not sure why this is marked in red color. Moreover all working sling models are marked as red but it is working as expected.

Do you see any errors in your bundle, if you click on the adapter highlighted in red, do you see extra info?

I tried to reproduce what you are doing but everything is working fine for me. What comes to my mind is that perhaps you have a required field that is not available in the resource that you are trying to adapt from, did you try to add "defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL" in your model signature?

This is what I did and works fine:

@Model(
        adaptables = { SlingHttpServletRequest.class, Resource.class },
        adapters = ProductDetailModel.class,
        resourceType = ProductDetailModelImpl.RESOURCE_TYPE)
@Exporter(
        name = "jackson",
        extensions = "json"
       )
public class ProductDetailModelImpl implements ProductDetailModel {

    public static final String RESOURCE_TYPE = "oshynDemo/components/helloworld";

    @9944223
    public String getProductDetail() {
        return "works";
    }
    
}

Servlet:

...//Servlet signature missing
public class EstebanServlet extends SlingSafeMethodsServlet {

    
    private static final long serialVersionUID = 1L;

    @9944223
    protected void doGet(final SlingHttpServletRequest req,
            final SlingHttpServletResponse resp) throws ServletException, IOException {
        final Resource resource = req.getResourceResolver().getResource("/content/oshynDemo/us/en/blog/jcr:content/root/container/container/helloworld");
        resp.setContentType("text/plain");
        ProductDetailModel model = resource.adaptTo(ProductDetailModel.class);
        resp.getWriter().write("Title = " + model.getProductDetail() );
    }

The resource I am trying to adapt from: "/content/oshynDemo/us/en/blog/jcr:content/root/container/container/helloworld"

Looks like this:

Hope this helps