1Z0-829 Java Platform Overview and Packaging Practice Question
Which TWO statements about module descriptors are true?
⚠ Common exam trap
Candidates often confuse 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.
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
✓
A module descriptor can use the opens keyword to enable deep reflection on specific packages.
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.
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.
- ✗
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.
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