How to display a json response mapped pojo in sightly

I have a sling servlet that invokes a 3rd party api and fetches a json response. I have mapped the json response to a pojo class using Jackson. I now have to display this dynamically fetched and mapped response in sightly. How do i do that? I am stuck after the response mapping

2 answers

  • answered 2022-05-02 06:47 Alexander Berndt

    The correct path is:

    HTL/Sightly -> Sling Model -> OSGi Service -> External API

    So you have to extract the code that fetches the data into an OSGi service.

    But please secure your code that calls the external API. As example if the External API is not responding or is extremely slow, it could consume all available threads of AEM. Then AEM could be completely unusable. To secure it, you could use as Example a Semaphore.

  • answered 2022-05-02 21:27 Dana Anthony

    Assuming the JSON returned is arbitrary, the best thing to do is simply display it as a string. To do that, instead of mapping the JSON response to a POJO I would recommend adapting a Sling model to the response.

    Then, you can set that Sling model to be the model in your sightly code, using data-sly-use.model, and in the Sling model constructor you can set the response value to an attribute of the sling model.

    Then all you'd need to do is put that attribute in a ${} in the sightly html.

    If the format/structure of the JSON isn't completely unknown, you could use the POJO in the sightly. Create some conditionals to test what attributes the POJO has, so you can put them into the sightly code.

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