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.
Which TWO statements about module descriptors are true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A module descriptor can use the opens keyword to enable deep reflection on specific packages.
Option B is correct because the `opens` keyword in a module descriptor (module-info.java) allows deep reflection (access to private members) on specific packages at runtime, which is necessary for frameworks like Hibernate or JPA that rely on reflection. Option E is correct because the `transitive` keyword is used only within `requires` directives to indicate that any module that requires the current module also implicitly requires the specified module.
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.
✗
A module descriptor can use the provides keyword to declare that it uses a service.
Why it's wrong here
provides declares an implementation; uses declares a service dependency.
✓
A module descriptor can use the opens keyword to enable deep reflection on specific packages.
Why this is correct
opens grants reflective access to all types in the package.
Related concept
Read the scenario before looking for a memorised answer.
✗
A module descriptor must require the java.base module explicitly.
Why it's wrong here
java.base is implicitly required; explicit is optional.
✗
A module descriptor can specify which packages are exported with the export keyword.
Why it's wrong here
The correct keyword is 'exports', not 'export'.
✓
A module descriptor can use the transitive keyword only with requires directives.
Why this is correct
transitive is applied to requires to propagate readability.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing the `provides` and `uses` keywords (service provider vs. service consumer) and mistaking the `export` keyword for the correct `exports` keyword, which is a common syntax error in module descriptors.
Trap categories for this question
Keyword trap
The correct keyword is 'exports', not 'export'.
Detailed technical explanation
How to think about this question
The `opens` directive in module-info.java controls reflective access, which is distinct from `exports` that controls compile-time and runtime access to public types. The `transitive` modifier on a `requires` directive creates a transitive dependency, meaning if module A requires module B with `transitive`, any module that requires A will also implicitly require B, which is critical for libraries that expose types from their dependencies. The `java.base` module is always resolved and does not need to be listed, as per the Java Module System specification (JSR 376).
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: A module descriptor can use the opens keyword to enable deep reflection on specific packages. — Option B is correct because the `opens` keyword in a module descriptor (module-info.java) allows deep reflection (access to private members) on specific packages at runtime, which is necessary for frameworks like Hibernate or JPA that rely on reflection. Option E is correct because the `transitive` keyword is used only within `requires` directives to indicate that any module that requires the current module also implicitly requires the specified module.
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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Question Discussion
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