The answer is that the module `com.example.util` is not on the module path. This error occurs because Java’s module system, introduced in Java 9 and refined through Java 17, performs strict resolution at startup: every module named in a `requires` directive must be present on the module path specified by `--module-path`. In the given launch command, `--module-path app.jar:lib` tells the resolver to look only inside `app.jar` and the `lib` directory; if `com.example.util` is missing from `lib`, the resolution fails with the exact `Module not found` message. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this scenario tests your understanding of module path configuration versus class path—a common trap is confusing the two or assuming transitive dependencies are automatically included. Remember the memory tip: “If it’s required, it must be on the path—no module, no launch.”
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 developer creates a module `com.example.app` that requires `java.sql` and `com.example.util`. The module is compiled and packaged into a JAR. When launching the application with `java --module-path app.jar:lib --module com.example.app`, it fails with `java.lang.module.ResolutionException: Module com.example.util not found`. 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 module `com.example.util` is not in the module path.
The error `Module com.example.util not found` indicates that the module system cannot locate `com.example.util` on the module path. Since the command specifies `--module-path app.jar:lib`, the JAR for `com.example.util` must be present in the `lib` directory (or another directory on that path). If it is missing or not in the correct location, the module resolution fails. Option B correctly identifies that the module is simply not on the module path.
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 module `com.example.util` is an automatic module and requires specific flags.
Why it's wrong here
Automatic modules are resolved without extra flags if on module path.
✓
The module `com.example.util` is not in the module path.
Why this is correct
The module path must include all required modules explicitly.
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 `com.example.util` is a named module but not exported.
Why it's wrong here
ResolutionException is about not found, not about exports.
✗
The module `com.example.util` is on the classpath and not visible to module system.
Why it's wrong here
If on classpath, it would be treated as unnamed module but not resolved by name.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between module resolution failures (missing module) and access control failures (module found but not exported), so candidates may incorrectly choose an option about exports or classpath visibility when the actual issue is that the module JAR is simply not present on the module path.
Detailed technical explanation
How to think about this question
The Java module system resolves modules by scanning the module path for `module-info.class` entries (for named modules) or for JARs with automatic module names derived from the manifest or filename. A `ResolutionException` occurs during the resolution phase, before any code runs, when a required module cannot be found in any of the specified module path entries. This is distinct from access control errors (e.g., `IllegalAccessError`) which happen later during module readability checks.
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.
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 module `com.example.util` is not in the module path. — The error `Module com.example.util not found` indicates that the module system cannot locate `com.example.util` on the module path. Since the command specifies `--module-path app.jar:lib`, the JAR for `com.example.util` must be present in the `lib` directory (or another directory on that path). If it is missing or not in the correct location, the module resolution fails. Option B correctly identifies that the module is simply not on the module path.
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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