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You try to run your Spring Boot app but get this error: 'java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication'. What is the likely cause?

medium📝 Debug Q6 of 15
Spring Boot - Fundamentals
You try to run your Spring Boot app but get this error: 'java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication'. What is the likely cause?
AThe Java version is incompatible
BThe main method is missing in the application class
CSpring Boot dependencies are missing from the build
DThe application.properties file is misconfigured
Step-by-Step Solution
Solution:

  1. Step 1: Analyze the error meaning

    NoClassDefFoundError means the class file is not found at runtime.

  2. Step 2: Identify missing dependencies

    SpringApplication class is part of Spring Boot starter; missing dependencies cause this error.

  3. Final Answer:

    Spring Boot dependencies are missing from the build -> Option C

  4. Quick Check:

    NoClassDefFoundError = missing dependencies [OK]
Quick Trick: Check your build dependencies if classes are missing [OK]
Common Mistakes:
  • Blaming main method absence
  • Assuming config file causes class errors
  • Ignoring dependency setup

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