The correct answer is that the com.example.app.internal package is accessible for deep reflection only by com.example.lib. This is because the `opens` directive in the Java module system grants deep reflective access—meaning private fields, methods, and constructors become accessible at runtime—but only to the module explicitly named in the `to` clause, here `com.example.lib`. Without the `to` clause, an `opens` directive would open the package to all modules, but with it, access is strictly limited. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of how the module system controls reflection, a common trap being that `opens` does not grant compile-time access like `exports` does. Remember the memory tip: "opens for runtime reflection, exports for compile-time connection"—and if you see `to`, only the listed module gets the key.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It is accessible for deep reflection only by com.example.lib.
Option A is correct because the exhibit shows that `com.example.app.internal` is declared with `opens com.example.app.internal to com.example.lib`. The `opens` directive grants deep reflection (access to private members) at runtime, but only to the specified module `com.example.lib`. Other modules cannot reflectively access this package unless they are explicitly listed.
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.
✓
It is accessible for deep reflection only by com.example.lib.
Why this is correct
The opens ... to directive grants reflective access to the named module only.
Related concept
Read the scenario before looking for a memorised answer.
✗
It is accessible for deep reflection by any module.
Why it's wrong here
Without 'to', it would be open to all; here it's restricted.
✗
It is not accessible for reflection at all.
Why it's wrong here
It is open for reflection to com.example.lib.
✗
It is exported to all modules.
Why it's wrong here
Only exports directive exports; opens does not export.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between `exports` (compile-time and runtime access to public types) and `opens` (runtime reflective access, including private members), and the trap here is that candidates confuse `opens` with `exports` or assume `opens` grants access to all modules unless a `to` clause is specified.
Detailed technical explanation
How to think about this question
In the Java Platform Module System (JPMS), `opens` provides reflective access (including private members) at runtime, while `exports` only grants compile-time and runtime access to public types. The `opens` directive is often used with frameworks like Hibernate or Spring that rely on reflection for serialization or dependency injection. A subtle behavior: if a package is both exported and opened, the `opens` directive is redundant for reflection but still required for deep reflection on private members.
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: It is accessible for deep reflection only by com.example.lib. — Option A is correct because the exhibit shows that `com.example.app.internal` is declared with `opens com.example.app.internal to com.example.lib`. The `opens` directive grants deep reflection (access to private members) at runtime, but only to the specified module `com.example.lib`. Other modules cannot reflectively access this package unless they are explicitly listed.
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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