The answer is a formatting error in the runtime-versions section of the buildspec.yml file. When using a standard managed CodeBuild image like Amazon Linux 2, Java is not pre-installed; it must be explicitly declared using the correct runtime identifier. The error "Unable to find a Java installation" occurs because the developer likely specified `java: 11` instead of the required format `java: corretto11`, which tells CodeBuild which specific Amazon Corretto distribution to install. On the AWS Certified Developer Associate DVA-C02 exam, this tests your understanding that managed images require precise runtime version syntax—a common trap is assuming you can use generic version numbers like "11" or "8". Remember, CodeBuild runtime identifiers follow a `language: distribution` pattern, so for Java you must specify the distribution name (e.g., corretto11, corretto8) rather than just the version number. A helpful memory tip: think "distribution before version" to avoid the formatting error.
DVA-C02 Deployment Practice Question
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 build a Java application. The build succeeds locally but fails in CodeBuild with the error 'BUILD FAILED: Unable to find a Java installation.' The buildspec.yml file includes a 'runtime-versions' section specifying Java 11. The CodeBuild project uses the 'aws/codebuild/amazonlinux2-x86_64-standard:4.0' image. What is the MOST likely cause of the failure?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The runtime-versions section in buildspec.yml is not correctly formatted.
The error 'Unable to find a Java installation' indicates that the CodeBuild environment does not have Java available at runtime. When using a standard managed image like 'aws/codebuild/amazonlinux2-x86_64-standard:4.0', Java must be explicitly declared in the 'runtime-versions' section of buildspec.yml. The most likely cause is that the 'runtime-versions' section is incorrectly formatted (e.g., using 'java: 11' instead of the correct 'java: corretto11'), causing CodeBuild to skip installing Java.
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 runtime-versions section in buildspec.yml is not correctly formatted.
Why this is correct
Incorrect formatting can cause Java not to be installed.
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 CodeBuild project does not have sufficient permissions to download Java.
Why it's wrong here
CodeBuild uses the image's built-in capabilities.
✗
The buildspec.yml file is not in the root of the source directory.
Why it's wrong here
CodeBuild looks for buildspec.yml in the root by default.
✗
The build commands reference a non-existent Maven dependency.
Why it's wrong here
Error is about Java, not dependencies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume 'java: 11' is a valid runtime identifier, but CodeBuild requires the exact runtime name (e.g., 'corretto11' or 'openjdk11'), and a formatting error in runtime-versions leads to a missing Java installation rather than a syntax error.
Detailed technical explanation
How to think about this question
In CodeBuild, the 'runtime-versions' section uses specific runtime identifiers like 'corretto11' for Amazon Corretto 11, not generic names like 'java: 11'. The managed image 'aws/codebuild/amazonlinux2-x86_64-standard:4.0' does not pre-install Java; it relies on the buildspec to trigger installation via the runtime-versions directive. A common real-world mistake is using 'java: 11' instead of 'java: corretto11', which causes CodeBuild to silently skip the runtime installation and leave Java absent.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 runtime-versions section in buildspec.yml is not correctly formatted. — The error 'Unable to find a Java installation' indicates that the CodeBuild environment does not have Java available at runtime. When using a standard managed image like 'aws/codebuild/amazonlinux2-x86_64-standard:4.0', Java must be explicitly declared in the 'runtime-versions' section of buildspec.yml. The most likely cause is that the 'runtime-versions' section is incorrectly formatted (e.g., using 'java: 11' instead of the correct 'java: corretto11'), causing CodeBuild to skip installing Java.
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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Question Discussion
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