- A
The 'build' phase command is incorrect, causing compilation to fail.
Why wrong: The error is about loading main class, not compilation.
- B
The build environment does not have Java installed.
Why wrong: CodeBuild images include Java.
- C
The buildspec.yml file does not include an 'install' phase to download dependencies.
The local machine may have dependencies pre-installed, but CodeBuild needs explicit installation.
- D
The 'artifacts' section in buildspec.yml is misconfigured.
Why wrong: Artifacts affect output, not build execution.
Question 1,575 of 1,616
Why CodeBuild Fails with 'Could Not Find or Load Main Class'
This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is using AWS CodeBuild to compile a Java application. The build project is configured with a 'buildspec.yml' file. The developer notices that the build succeeds on the local machine but fails in CodeBuild with the error: 'Error: Could not find or load main class com.example.App'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The buildspec.yml file does not include an 'install' phase to download dependencies.
Option C is correct because the error 'Could not find or load main class com.example.App' indicates that the compiled class files are missing or not in the classpath, which typically occurs when Maven or Gradle dependencies are not downloaded. In CodeBuild, the 'install' phase is responsible for running commands like 'mvn install' or 'gradle build' to resolve and download dependencies. Without an explicit 'install' phase in buildspec.yml, CodeBuild skips dependency resolution, causing compilation to succeed locally (where dependencies are cached) but fail in CodeBuild.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'build' phase command is incorrect, causing compilation to fail.
Why it's wrong here
The error is about loading main class, not compilation.
- ✗
The build environment does not have Java installed.
Why it's wrong here
CodeBuild images include Java.
- ✓
The buildspec.yml file does not include an 'install' phase to download dependencies.
Why this is correct
The local machine may have dependencies pre-installed, but CodeBuild needs explicit installation.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'artifacts' section in buildspec.yml is misconfigured.
Why it's wrong here
Artifacts affect output, not build execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse a runtime class-loading error with a compilation error, assuming the 'build' phase is misconfigured, when the root cause is the missing 'install' phase that resolves dependencies before compilation.
Trap categories for this question
Command / output trap
Artifacts affect output, not build execution.
Detailed technical explanation
How to think about this question
Under the hood, CodeBuild executes buildspec phases sequentially: 'install', 'pre_build', 'build', and 'post_build'. The 'install' phase runs dependency managers like Maven (mvn dependency:resolve) or Gradle (gradle dependencies) to populate the local repository (~/.m2 or ~/.gradle). If omitted, CodeBuild's default behavior is to skip dependency installation, so the 'build' phase (e.g., mvn compile) fails to find required JARs, leading to missing compiled classes. A real-world scenario is when a developer uses a local IDE with cached dependencies but pushes code to CodeBuild without a proper 'install' phase, causing intermittent failures.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The buildspec.yml file does not include an 'install' phase to download dependencies. — Option C is correct because the error 'Could not find or load main class com.example.App' indicates that the compiled class files are missing or not in the classpath, which typically occurs when Maven or Gradle dependencies are not downloaded. In CodeBuild, the 'install' phase is responsible for running commands like 'mvn install' or 'gradle build' to resolve and download dependencies. Without an explicit 'install' phase in buildspec.yml, CodeBuild skips dependency resolution, causing compilation to succeed locally (where dependencies are cached) but fail in CodeBuild.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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