Template "hot reload"

I’m testing a dummy template as follows:

.get("/test", ctx -> ctx.render("templates/test.mustache", new HashMap<>()));

Editing the template (test.mustache) requires restarting the app (or maybe rebuilding the app, but stop + run in Eclipse anyway).

It’s a major use case to be able to work with a template without a need of restarting the Javalin app for every change. I even tried to add .enableStaticFiles(“src/resources/templates”, Location.EXTERNAL), but no luck.

Is this a feature? Works differently in SparkJava by the way.

Thanks!

[tipsy]

Happy you found a solution @valtterip!

Gotta be done for every request, so obviously for development purposes only, but I’m fine with this now.

Instead of doing it “manually” per request, you could register a new FileRenderer:

JavalinRenderer.register((filePath, model) -> {
    MustacheFactory mustacheFactory = new DefaultMustacheFactory("./");
    StringWriter stringWriter = new StringWriter();
    mustacheFactory.compile(filePath).execute(stringWriter, model).close();
    return stringWriter.toString();
 )}, ".mustache")

Then you could use Javalin like normal, with calls to ctx.render(...).

Some sort of reload-on-modify -option would be cool

I don’t think anything template-specific should be included in Javalin, other than a minimal example implementation that can be overridden by the user.

[tipsy]

I don’t think this belongs in Javalin, tbh.

I agree, but thank you for documenting your solution here. I’ve added the info tag.