The answer is that the com.example.lib module was not added via --add-modules. This is correct because when using jlink to create a custom runtime image, only the modules explicitly specified with --add-modules—along with their transitive dependencies—are included in the resulting image. If the application relies on com.example.lib but that module was omitted from the jlink command, its classes will be absent from the image, leading directly to a NoClassDefFoundError at runtime. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of jlink’s module resolution behavior, a common trap where candidates assume all required modules are automatically included. Remember that jlink does not perform runtime discovery; it only packages what you explicitly tell it to. A useful memory tip: think of jlink as a minimalist packer—if you don’t add it, it’s not there.
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.
Network Topology
Refer to the exhibit. The resulting image directory includes a 'bin' directory with java launcher. When running the application, a NoClassDefFoundError occurs for a class from module com.example.lib. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The com.example.lib module was not added via --add-modules.
When using jlink to create a custom runtime image, only the modules explicitly specified (or their transitive dependencies) are included. If the application depends on com.example.lib but it was not added via --add-modules, the module's classes will be missing from the image, causing a NoClassDefFoundError at runtime. This is the most direct cause among the options.
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 --compress=2 option altered the class.
Why it's wrong here
Compression does not alter class functionality; it compresses resources in the image.
✗
The application uses reflection to access the class.
Why it's wrong here
Reflection would cause ClassNotFoundException, not NoClassDefFoundError at startup.
✓
The com.example.lib module was not added via --add-modules.
Why this is correct
Only modules explicitly added (and their transitive dependencies) are included.
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 --strip-debug option removed the class file.
Why it's wrong here
--strip-debug only removes debug information, not class files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between missing classes due to module omission (NoClassDefFoundError) versus missing classes due to reflection (ClassNotFoundException), and candidates may confuse --strip-debug with removing class files.
Detailed technical explanation
How to think about this question
jlink uses the module graph to determine which modules to include in the runtime image; if a module is not explicitly added via --add-modules or is not a transitive dependency of an included module, its classes are omitted. The NoClassDefFoundError occurs when the JVM's class loader attempts to load a class that was present at compile time but is missing from the runtime image, which is a common pitfall when creating minimal images with jlink. In real-world scenarios, this often happens when using libraries that are not explicitly declared as module dependencies or when the application relies on automatic modules.
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 com.example.lib module was not added via --add-modules. — When using jlink to create a custom runtime image, only the modules explicitly specified (or their transitive dependencies) are included. If the application depends on com.example.lib but it was not added via --add-modules, the module's classes will be missing from the image, causing a NoClassDefFoundError at runtime. This is the most direct cause among the options.
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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Question Discussion
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