- A
The application runs successfully because com.example.store is added with --add-modules, and its exported packages are available.
--add-modules makes com.example.store available to other modules, including the main module.
- B
The application throws NoClassDefFoundError because the Main class is in a different module.
Why wrong: The main class is specified correctly as com.example.payment/com.example.payment.Main.
- C
The application runs successfully because com.example.store is on the module path.
Why wrong: It runs, but not because of that reason; the main module is payment.
- D
The application throws ModuleNotFoundException because com.example.store is not required by com.example.payment.
Why wrong: Although not required, --add-modules adds it anyway; it's optional.
Quick Answer
The correct answer is that the application runs successfully because `--add-modules com.example.store` explicitly adds that module to the root set at startup, making its exported packages available to the unnamed module. This works because the unnamed module, which contains the `Main` class when no module descriptor is present, can access any exported package from a module that has been added via `--add-modules`, even without a `requires` clause. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of how the unnamed module interacts with named modules at runtime, a common source of confusion. The trap is that many candidates assume the unnamed module cannot access named module packages without a module-info file, but `--add-modules` bypasses that requirement for resolution. Remember the mnemonic: “Add to access, no module needed”—if you add the module explicitly, the unnamed module gains full access to its exported packages.
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.
Given the module descriptor and invocation, what will happen?
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 application runs successfully because com.example.store is added with --add-modules, and its exported packages are available.
Option A is correct because the `--add-modules com.example.store` directive explicitly adds the module `com.example.store` to the set of root modules at startup, making its exported packages available to the unnamed module (or to modules that do not otherwise require it). Since the `Main` class is in the unnamed module (not in a named module), it can access the exported packages of `com.example.store` without a `requires` clause. This is the intended behavior of `--add-modules` for resolving modules that are not automatically resolved.
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 application runs successfully because com.example.store is added with --add-modules, and its exported packages are available.
Why this is correct
--add-modules makes com.example.store available to other modules, including the main module.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The application throws NoClassDefFoundError because the Main class is in a different module.
Why it's wrong here
The main class is specified correctly as com.example.payment/com.example.payment.Main.
- ✗
The application runs successfully because com.example.store is on the module path.
Why it's wrong here
It runs, but not because of that reason; the main module is payment.
- ✗
The application throws ModuleNotFoundException because com.example.store is not required by com.example.payment.
Why it's wrong here
Although not required, --add-modules adds it anyway; it's optional.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that simply placing a module on the module path makes it automatically accessible to the unnamed module, but the module system requires explicit opt-in via `--add-modules` for modules not required by a named module.
Detailed technical explanation
How to think about this question
Under the hood, the Java module system uses a set of root modules to determine which modules are resolved at startup. The unnamed module (where the application's main class resides if not in a named module) cannot access modules that are not root modules unless they are explicitly added via `--add-modules`. This mechanism is defined in the Java Language Specification (JLS) and the Java Virtual Machine Specification (JVMS). A real-world scenario is when a legacy application (unnamed module) needs to use a library that has been modularized; `--add-modules` bridges the gap without requiring the application to be modularized.
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 application runs successfully because com.example.store is added with --add-modules, and its exported packages are available. — Option A is correct because the `--add-modules com.example.store` directive explicitly adds the module `com.example.store` to the set of root modules at startup, making its exported packages available to the unnamed module (or to modules that do not otherwise require it). Since the `Main` class is in the unnamed module (not in a named module), it can access the exported packages of `com.example.store` without a `requires` clause. This is the intended behavior of `--add-modules` for resolving modules that are not automatically resolved.
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.
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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