The answer is that the `com.example.service` module does not export the `com.example.service.api` package. In the Java Platform Module System (JPMS), the `exports` directive is the sole mechanism for granting access to a package’s public types from other modules; a `requires` directive alone only establishes a dependency but does not open the package. This question tests your understanding of the JPMS exports directive and its critical role in encapsulation, a frequent exam topic on the Oracle Certified Professional Java SE 17 Developer 1Z0-829. A common trap is confusing `requires` with `exports`—students often assume that adding a `requires` line automatically makes all packages visible. Remember the mnemonic: “Requires for reading, exports for exposing.” Without an explicit `exports` directive in the owning module’s `module-info.java`, even a valid `requires` leaves the package sealed and inaccessible.
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 Java 17 application uses the Java Platform Module System (JPMS). The module 'com.example.service' exports 'com.example.service.api' and requires 'java.logging'. Another module 'com.example.client' requires 'com.example.service'. The client module cannot access the 'com.example.service.api' package. What is the most likely reason?
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.client' module does not contain a 'requires com.example.service' directive.
Option C is correct because the question states that the client module 'requires com.example.service', so the client module does contain the required directive. The most likely reason the client cannot access 'com.example.service.api' is that the 'com.example.service' module does not export that package. According to JPMS, a package must be explicitly exported via the 'exports' directive in the module-info.java of the owning module for other modules to access its public types. Without that export, even with a 'requires' directive, the package remains inaccessible.
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 'com.example.service' module does not use 'requires transitive' for 'java.logging'.
Why it's wrong here
Transitive is for propagating dependencies; it does not affect access to exported packages of the service module itself.
✗
The 'com.example.service.api' package is not exported by 'com.example.service'.
Why it's wrong here
The question states it is exported.
✓
The 'com.example.client' module does not contain a 'requires com.example.service' directive.
Why this is correct
A module must require the module that exports the packages it needs.
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 'java.logging' module does not export its packages to 'com.example.service'.
Why it's wrong here
This is irrelevant to accessing com.example.service.api.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the 'requires' directive alone grants access to all packages of the required module, but JPMS requires explicit 'exports' for each package to be accessible, and the question's phrasing 'cannot access' often misleads into thinking the 'requires' directive is missing when it is actually present.
Detailed technical explanation
How to think about this question
Under JPMS, the 'exports' directive in a module's declaration makes a package accessible to all other modules at compile time and runtime, but only if those modules have a 'requires' directive for the exporting module. If a package is not exported, even with a 'requires' directive, the package's public types are invisible. A real-world scenario where this matters is when a library module exports an API package but forgets to export an internal utility package, causing compilation failures in dependent modules despite correct 'requires' directives.
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.client' module does not contain a 'requires com.example.service' directive. — Option C is correct because the question states that the client module 'requires com.example.service', so the client module does contain the required directive. The most likely reason the client cannot access 'com.example.service.api' is that the 'com.example.service' module does not export that package. According to JPMS, a package must be explicitly exported via the 'exports' directive in the module-info.java of the owning module for other modules to access its public types. Without that export, even with a 'requires' directive, the package remains inaccessible.
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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