ATLAS-5259: ATLAS UI: Classic UI fails to load when switching from React UI due to missing Bootstrap assets#576
Merged
pawarprasad123 merged 1 commit intomasterfrom Mar 25, 2026
Merged
Conversation
…act UI due to missing Bootstrap assets
pawarprasad123
requested review from
chaitalicod,
mandarambawane and
pinal-shah
mandarambawane
approved these changes
Mar 24, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
What changes were proposed in this pull request?
Steps to reproduce
Log in to Atlas.
Open the account menu in the top-right.
Click "Switch to Classic".
Observe the Classic UI stuck on the loading spinner.
Observed behavior
Classic UI does not load; it remains on the loader.
Console errors:
404 (Not Found) for js/libs/bootstrap/js/bootstrap.min.js
MIME type error: Refused to apply style from '.../bootstrap.min.css' because its MIME type ('text/html') is not a supported stylesheet MIME type
Uncaught Error: Script error for "bootstrap" from RequireJS
Root cause
dashboardv2 uses bootstrap-xss-patched, which provides different filenames than standard Bootstrap. The Grunt copy task expects:
bootstrap/dist/js/bootstrap.min.js
bootstrap/dist/css/bootstrap.min.css
bootstrap-xss-patched actually provides:
bootstrap/dist/js/bootstrap-patched.min.js
bootstrap/dist/css/bootstrap-patched.min.css
Because the expected files are absent, the Grunt build does not copy Bootstrap assets into the dist folder. The server then responds with an HTML error page for the Bootstrap URLs, which triggers MIME type checks and causes RequireJS to fail loading the bootstrap module.
Fix Update
dashboardv2/gruntfile.js so the copy:bootstrap task uses:
bootstrap-patched.min.js instead of bootstrap.min.js
bootstrap-patched.min.css instead of bootstrap.min.css
Affected components
atlas-dashboardv2 (Classic UI)
How was this patch tested?
Manually tested, build process