1Z0-829 Java Platform Overview and Packaging Practice Question
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?
⚠ Common exam trap
Test-takers frequently 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.
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 version from META-INF/versions/11/
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.
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.
- ✗
The version from META-INF/versions/17/
Why it's wrong here
There is no version 17 directory; it would need to exist.
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