Question 307 of 519

Java Platform Overview and Packaging →hardMultiple ChoiceObjective-mapped

1Z0-829 Java Platform Overview and Packaging Practice Question

This 1Z0-829 practice question tests your understanding of java platform overview and packaging. 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 team uses 'jlink' to create a custom runtime image for a modular application. They run the following command: 'jlink --module-path $JAVA_HOME/jmods:myapp --add-modules com.example.myapp --output myimage'. The application requires several non-Java native libraries (e.g., .so files) that are loaded via System.loadLibrary(). After creating the image, the application fails with an UnsatisfiedLinkError. 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.

A
The native library loading requires a module that exports the package containing the native method.
Why wrong: Native libraries are loaded via library path; module exports affect Java-level accessibility.
B
The --add-modules flag omitted transitive dependencies of com.example.myapp.
Why wrong: jlink resolves transitive dependencies automatically; the missing native libraries are the issue.
C
The native libraries were not included in the image; they must be manually copied or added using --add-modules and a custom module.
jlink images only contain Java modules; native code must be placed in the appropriate directory (e.g., lib) or bundled via a module.
D
The --module-path must also include the directories containing the native libraries.
Why wrong: The module path is for Java modules, not native libraries.

Full breakdown with real-world context →

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 native libraries were not included in the image; they must be manually copied or added using --add-modules and a custom module.

Option C is correct because the `jlink` tool creates a runtime image that includes only Java modules and their dependencies, not native libraries (e.g., .so files). Native libraries must be manually placed into the image's library path (e.g., `lib/` or `bin/` directory) or packaged into a custom module that is added via `--add-modules`. The `UnsatisfiedLinkError` occurs because `System.loadLibrary()` cannot find the native library in the image's expected locations.

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 native library loading requires a module that exports the package containing the native method.
Why it's wrong here
Native libraries are loaded via library path; module exports affect Java-level accessibility.
✗
The --add-modules flag omitted transitive dependencies of com.example.myapp.
Why it's wrong here
jlink resolves transitive dependencies automatically; the missing native libraries are the issue.
✓
The native libraries were not included in the image; they must be manually copied or added using --add-modules and a custom module.
Why this is correct
jlink images only contain Java modules; native code must be placed in the appropriate directory (e.g., lib) or bundled via a module.
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 --module-path must also include the directories containing the native libraries.
Why it's wrong here
The module path is for Java modules, not native libraries.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume `jlink` automatically includes all dependencies, including native libraries, but `jlink` only handles Java modules and ignores non-Java artifacts like native `.so` or `.dll` files.

Detailed technical explanation

How to think about this question

Under the hood, `jlink` uses the `jmod` files and module JARs to assemble a minimal JVM runtime, but it does not scan for or copy native libraries. The native library search path in a custom image is determined by `java.library.path`, which defaults to the image's `lib` directory (or `bin` on Windows). Real-world scenarios often involve JNI-based libraries (e.g., OpenCV, TensorFlow) that must be manually deployed into the image's library directory or bundled as a resource in a custom module that extracts them at runtime.

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.

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FAQ

Questions learners often ask

What does this 1Z0-829 question test?

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 native libraries were not included in the image; they must be manually copied or added using --add-modules and a custom module. — Option C is correct because the `jlink` tool creates a runtime image that includes only Java modules and their dependencies, not native libraries (e.g., .so files). Native libraries must be manually placed into the image's library path (e.g., `lib/` or `bin/` directory) or packaged into a custom module that is added via `--add-modules`. The `UnsatisfiedLinkError` occurs because `System.loadLibrary()` cannot find the native library in the image's expected locations.

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.

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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