1Z0-829 Java Platform Overview and Packaging Practice Question
This 1Z0-829 practice question tests your understanding of java platform overview and packaging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company uses a multi-release JAR (MR-JAR) that contains classes for Java 9 and Java 11 in `META-INF/versions/9/` and `META-INF/versions/11/` respectively. The application runs on Java 17. Which version of a class that exists in both versioned directories is loaded?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The version from META-INF/versions/11/
Option C is correct because in a multi-release JAR (MR-JAR), the Java runtime selects the versioned directory that matches the major version of the running Java platform, or the highest versioned directory that does not exceed that version. Since the application runs on Java 17, and the highest available versioned directory is for Java 11 (META-INF/versions/11/), the class from that directory is loaded. The root directory is used only when no appropriate versioned directory exists.
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 version from META-INF/versions/9/
Why it's wrong here
Version 9 is lower than 11; Java 17 will prefer a higher version if available.
✗
The version from the root of the JAR
Why it's wrong here
Root is used only if no versioned directory matches the runtime version.
✓
The version from META-INF/versions/11/
Why this is correct
Java 17 selects the highest version ≤ 17, which is 11 if present.
Related concept
Read the scenario before looking for a memorised answer.
✗
The version from META-INF/versions/17/
Why it's wrong here
There is no version 17 directory; it would need to exist.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the runtime will load the version matching the exact running Java version (Java 17) or fall back to the root, but the MR-JAR specification actually selects the highest versioned directory that does not exceed the current version, not the exact match or the root.
Detailed technical explanation
How to think about this question
Under the hood, the MR-JAR mechanism relies on the `Multi-Release: true` manifest entry and the `URLClassLoader` or the built-in application class loader, which inspects `META-INF/versions/` subdirectories in descending order of version numbers. The JAR specification (JEP 238) defines that the runtime uses the highest version directory whose number is ≤ the current major version; if the current version exceeds all versioned directories, the highest available is used. A real-world scenario is deploying a library compiled for Java 11 on a Java 17 runtime, where the Java 11-specific optimizations (e.g., newer `List.of()` or `Optional` methods) are used without requiring a recompile.
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 practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Java Platform Overview and Packaging — This question tests Java Platform Overview and Packaging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The version from META-INF/versions/11/ — Option C is correct because in a multi-release JAR (MR-JAR), the Java runtime selects the versioned directory that matches the major version of the running Java platform, or the highest versioned directory that does not exceed that version. Since the application runs on Java 17, and the highest available versioned directory is for Java 11 (META-INF/versions/11/), the class from that directory is loaded. The root directory is used only when no appropriate versioned directory exists.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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