The correct answer is that the --add-exports command-line flag allows you to export a package from one module to a specific target module at runtime. This flag is essential because the Java module system enforces strong encapsulation by default, meaning a named module cannot access packages from another module unless they are explicitly exported in the source module’s module-info.java file. The --add-exports flag overrides this restriction, making a package accessible to a designated module without modifying the original module’s declaration, which is particularly useful during development or testing when you need temporary access to internal APIs. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of how to relax module boundaries for debugging or migration scenarios, and a common trap is confusing it with --add-opens, which opens packages for deep reflection rather than just compile-time or runtime access. Remember the mnemonic: “Exports for access, opens for reflection.”
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 are true about the Java module system?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The --add-exports flag can be used to export a package from one module to a specific target module.
Option B is correct because the --add-exports command-line flag allows you to export a package from one module to a specific target module at runtime, overriding the module system's encapsulation. This is useful for modules that do not export a package by default but need to be accessed by a specific module during development or testing.
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 --add-exports command-line flag opens a package for deep reflection.
Why it's wrong here
--add-exports adds compile-time and runtime access; --add-opens is for reflection.
✓
The --add-exports flag can be used to export a package from one module to a specific target module.
Why this is correct
It allows a module to access the public types of a package in another module.
Related concept
Read the scenario before looking for a memorised answer.
✗
The jlink tool can generate module-info.java files for automatic modules.
Why it's wrong here
jlink does not generate module descriptors; it creates runtime images.
✓
A named module must have a module-info.java file in its root directory.
Why this is correct
The module descriptor defines the module.
Related concept
Read the scenario before looking for a memorised answer.
✗
The exports directive can be used to export a specific class to another module.
Why it's wrong here
Exports are at package level, not class level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between --add-exports (for type access) and --add-opens (for deep reflection), and the fact that exports are at the package level, not class level, causing candidates to confuse these concepts.
Detailed technical explanation
How to think about this question
The --add-exports flag is a JVM command-line option that modifies the module graph at startup, effectively adding an exports clause to the source module for the specified target module. This is commonly used in testing scenarios where a module's internal packages need to be accessed by test code without modifying the module's module-info.java. The jlink tool, on the other hand, uses the module graph to create a minimal runtime image, but it cannot generate module-info.java files because automatic modules lack explicit module declarations and are inferred from the JAR's metadata.
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 --add-exports flag can be used to export a package from one module to a specific target module. — Option B is correct because the --add-exports command-line flag allows you to export a package from one module to a specific target module at runtime, overriding the module system's encapsulation. This is useful for modules that do not export a package by default but need to be accessed by a specific module during development or testing.
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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