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You added springdoc-openapi-starter-webmvc-ui but Swagger UI shows a blank page. What is the most likely cause?

medium📝 Debug Q6 of 15
Spring Boot - API Documentation
You added springdoc-openapi-starter-webmvc-ui but Swagger UI shows a blank page. What is the most likely cause?
AMissing @SpringBootApplication annotation in main class.
Bspringdoc-openapi version conflicts with Spring Boot version.
CAPI controllers are not annotated with @RestController.
DIncorrect URL path used to access Swagger UI.
Step-by-Step Solution
Solution:

  1. Step 1: Check compatibility issues

    Version conflicts between springdoc-openapi and Spring Boot can cause UI loading issues.

  2. Step 2: Evaluate other options

    Missing @SpringBootApplication or wrong URL usually cause startup or 404 errors, not blank UI.

  3. Final Answer:

    springdoc-openapi version conflicts with Spring Boot version -> Option B

  4. Quick Check:

    Version conflict = blank Swagger UI page [OK]
Quick Trick: Match springdoc-openapi version with Spring Boot [OK]
Common Mistakes:
  • Ignoring version compatibility
  • Assuming URL or annotations cause blank UI
  • Not checking console errors for clues

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