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Heroku: 500 error on new application with app.json

Roeland Moors •
I deployed a new application to heroku with app.json and get the error below.
(the website is showing a 500 error but the errors in heroku are blue instead of red)
Do I need an extra build step? Maybe caused by the new bundling packages?
2021-09-26T08:17:00.561570+00:00 app[web.1]: I, [2021-09-26T08:17:00.561490 #4]  INFO -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267] Started GET "/" for 84.193.175.197 at 2021-09-26 08:17:00 +0000
2021-09-26T08:17:00.563004+00:00 app[web.1]: I, [2021-09-26T08:17:00.562945 #4]  INFO -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267] Processing by StaticController#index as HTML
2021-09-26T08:17:00.564160+00:00 app[web.1]: D, [2021-09-26T08:17:00.564119 #4] DEBUG -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267]   Rendering layout layouts/application.html.erb
2021-09-26T08:17:00.564218+00:00 app[web.1]: D, [2021-09-26T08:17:00.564194 #4] DEBUG -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267]   Rendering static/index.html.erb within layouts/application
2021-09-26T08:17:00.564317+00:00 app[web.1]: I, [2021-09-26T08:17:00.564293 #4]  INFO -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267]   Rendered static/index.html.erb within layouts/application (Duration: 0.0ms | Allocations: 4)
2021-09-26T08:17:00.565119+00:00 app[web.1]: I, [2021-09-26T08:17:00.565080 #4]  INFO -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267]   Rendered layout layouts/application.html.erb (Duration: 0.9ms | Allocations: 300)
2021-09-26T08:17:00.565323+00:00 app[web.1]: I, [2021-09-26T08:17:00.565293 #4]  INFO -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267] Completed 500 Internal Server Error in 2ms (Allocations: 795)
2021-09-26T08:17:00.566286+00:00 app[web.1]: F, [2021-09-26T08:17:00.566251 #4] FATAL -- : [3c0d9bbf-cc86-4647-859c-82e3338b3267]   
2021-09-26T08:17:00.566286+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267] ActionView::Template::Error (The asset "application.js" is not present in the asset pipeline.
2021-09-26T08:17:00.566287+00:00 app[web.1]: ):
2021-09-26T08:17:00.566287+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     12:     <%= csp_meta_tag %>
2021-09-26T08:17:00.566288+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     13:     <meta name="viewport" content="width=device-width, initial-scale=1">
2021-09-26T08:17:00.566288+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     14: 
2021-09-26T08:17:00.566288+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     15:     <%= javascript_include_tag "application", "data-turbo-track": "reload", defer: true %>
2021-09-26T08:17:00.566289+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     16:     <%= stylesheet_link_tag "application", media: "all", "data-turbo-track": "reload" %>
2021-09-26T08:17:00.566289+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     17: 
2021-09-26T08:17:00.566289+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]     18:     <%# Be sure to add your own custom favicons %>
2021-09-26T08:17:00.566289+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267]   
2021-09-26T08:17:00.566290+00:00 app[web.1]: [3c0d9bbf-cc86-4647-859c-82e3338b3267] app/views/layouts/application.html.erb:15


Roeland Moors •
I added the node buildpack like explained here: https://github.com/jumpstart-pro/jumpstart-pro/issues/67
Now it works.
Franck PATTE •
Hello there,
I have the same kind of issue.
I did a fresh install and deployed on Heroku,
I got a 500 error, Heroku logs says:
The asset "application.js" is not present in the asset pipeline
I tried your solution by changing app.json and pushing again to Heroku
-- "buildpacks": [{ "url": "heroku/ruby" }],
++"buildpacks": [{ "url": "heroku/nodejs" }, { "url": "heroku/ruby" }],

I'm stuck,
what did I miss?  is it the same error/issue?


HEROKU LOGS
2021-09-28T07:53:26.434719+00:00 app[web.1]: F, [2021-09-28T07:53:26.434680 #4] FATAL -- : [b193dab0-0287-4384-933a-d47c52e36395]
2021-09-28T07:53:26.434720+00:00 app[web.1]: [b193dab0-0287-4384-933a-d47c52e36395] ActionView::Template::Error (The asset "application.js" is not present in the asset pipeline.

Franck PATTE •
I did add the Webpack heroku/nodejs directly from the Heroku dashboard
it works !
still wondering while it didn't work with app.json
 
Roeland Moors •
I think app.json is only used with a fresh deploy to heroku, the first setup: https://devcenter.heroku.com/articles/setting-up-apps-using-the-heroku-platform-api 
Will Read •
I ran in to this too. Feels like the app.js should be changed so that the first deploy picks up the nodejs buildpack, no?
Will Read •
Looks like Chris Oliver fixed this 19 days ago.
Chris Oliver •
Heroku is able to add heroku/nodejs buildpack automatically with webpacker, but not with jsbundling so you have to go back to adding the buildpack yourself now.

They're considering fixing that, but not yet. Oh heroku.
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