How to parse HTL content

I'm loading a resource in AEM using SlingRequestProcessor as the example available here.

My page/html file looks like:

<div data-sly-use.stepPlanItem="stepPlanItemTemplate.html"
    data-sly-call="${stepPlanItem.step @ step = step}"
    data-sly-unwrap />

But, when I invoke requestProcessor.processRequest(req, resp, request.getResourceResolver()); nothing happens. I'm getting exactly the same content of the file. Nothing is being parsed.

My main question is: How can I parse sly tags from Java code?

Should I use filters? Which one? This is a page (not an AEM one) just an HTL snippet.

Solution

You do not need to parse HTL files, this is done by the Sling Scripting Engine implementation. You are always processing/loading a resource and it needs to be resolved according to the Sling resource resolution.

Assuming you are trying to load a resource at: /content/myapp/mypage.html that has a sling:resourceType=myapp/myfile, you would put the above code snippet in an /apps/myapp/myfile/myfile.html file so that the scripting engine can execute the HTL.