- 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.
Quick Answer
The answer is that the native libraries were not included in the image, so they must be manually copied or added using a custom module. This is correct because jlink creates a runtime image containing only Java modules and their dependencies; it does not automatically bundle non-Java native libraries like .so files. When System.loadLibrary() is called, the JVM searches the image’s library path (e.g., lib/ or bin/), and if the native library is absent, an UnsatisfiedLinkError is thrown. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding that jlink is a module-linker, not a native-library packager—a common trap is assuming jlink handles all dependencies. Remember the mnemonic: “jlink links Java, not natives; copy .so files to lib/ to fix the link.”
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.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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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Java Platform Overview and Packaging — study guide chapter
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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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Last reviewed: Jun 25, 2026
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