How can I get a Component in Structure Group metadata?

Question

UPDATED

We haven't found a solution, and we think every step is right. What are we missing??

Core Initializer: @RegisteredViewModel(viewName = "myPage",modelClass = CustomPageModelImpl.class)

CustomPageModelImpl: @SemanticEntity(entityName = "myPage", vocabulary = SDL_CORE, prefix = "m") public class CustomPageModelImpl extends PageModelImpl {}

myPage.jspx

JAVA ERROR: PageModelImpl cannot be cast to CustomPageModelImpl

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I need to get a component included in Structure Group metadata. To have this information in the page I include the template "Add inherited metadata to page" in the page template and I can see in the JSON the value of that metadata:

MetadataFields":{"promotion":{"Name":"promotion","Values":["tcm:47-129384"],"NumericValues":[],"DateTimeValues":[],"LinkedComponentValues":...

The problem that I have is when I try to get that information in the view:

${pageModel.meta["promotion"]}

I am using dxa 1.5 with Java.

I tried to extend the PageModelImpl as an Entity to get the Metadata creating a "CustomPageModelImpl":

@SemanticEntity(entityName = "MyPage", vocabulary = SDL_CORE, prefix = "m") public class CustomPageModelImpl extends PageModelImpl { [...] }

And using this entity as a Bean in the Page view:

jsp:useBean id="pageModel" type="com.dxa.api.model.entity.CustomPageModelImpl" scope="request"

It returns an error when the page load:

ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/web].[jsp]] (http-localhost/127.0.0.1:8080-1) JBWEB000236: Servlet.service() for servlet jsp threw exception: java.lang.ClassCastException: com.sdl.webapp.common.api.model.page.PageModelImpl cannot be cast to com.dxa.api.model.entity.CustomPageModelImpl

How can I get the TCM of the component included in SG metadata? or how can I get the information of that component?

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Edited: I think that my issue can be here:

@SemanticEntity(entityName = "MyPage", vocabulary = SDL_CORE, prefix = "m")

I am not sure what I have to write in the "entityName" param.

Answer 1

The thing you are observing with PageModel.meta is a Known Issue. See https://github.com/sdl/dxa-web-application-java/issues/21

However, if you want to use Page Metadata, you can better define your own Page Model and use semantic mapping for the metadata fields. Basically, what you also tried to do.

The missing step is that you should register your custom Page Model (using the @RegisteredViewModel annotation) and associate it with the Page View you are using.