- A
The module path is searched after the class path when resolving types.
Why wrong: The module path and class path are separate; the class path is used for unnamed module and the module path for named modules.
- B
The module declaration is stored in a file named module-info.java.
The module declaration is placed in module-info.java, which is compiled to module-info.class.
- C
A module must explicitly export a package to make it accessible to other modules.
By default, a package is not exported; it must be declared with the exports directive.
- D
An automatic module is one that has a module-info.class file at its root.
Why wrong: An automatic module is created from a JAR placed on the module path without a module-info.class.
- E
A named module can access the unnamed module without any explicit declaration.
Why wrong: Named modules are not allowed to read the unnamed module unless the --add-reads flag is used.
Quick Answer
The correct answer is that a module must explicitly export a package to make it accessible to other modules, and the module declaration is stored in a file named module-info.java. This is because the Java Platform Module System (JPMS) enforces strong encapsulation by default; a package is not automatically visible outside its module unless the module explicitly declares an exports directive. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of the three Java module types—named, automatic, and unnamed modules—and how module-info.java governs accessibility. A common trap is assuming that all packages within a named module are automatically accessible, but only those explicitly exported are; automatic modules, by contrast, export all their packages implicitly. For the exam, remember the mnemonic "N-A-U" for Named (explicit exports), Automatic (implicit exports), Unnamed (no module-info).
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 Platform Module System (JPMS) introduced in Java 9?
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 module declaration is stored in a file named module-info.java.
Option B is correct because the module declaration in JPMS is indeed stored in a file named module-info.java, which is compiled into module-info.class and placed at the root of the module. This file defines the module's name, dependencies (requires), and exported packages (exports).
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 module path is searched after the class path when resolving types.
Why it's wrong here
The module path and class path are separate; the class path is used for unnamed module and the module path for named modules.
- ✓
The module declaration is stored in a file named module-info.java.
Why this is correct
The module declaration is placed in module-info.java, which is compiled to module-info.class.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A module must explicitly export a package to make it accessible to other modules.
Why this is correct
By default, a package is not exported; it must be declared with the exports directive.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An automatic module is one that has a module-info.class file at its root.
Why it's wrong here
An automatic module is created from a JAR placed on the module path without a module-info.class.
- ✗
A named module can access the unnamed module without any explicit declaration.
Why it's wrong here
Named modules are not allowed to read the unnamed module unless the --add-reads flag is used.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the search order of module path vs. class path (A) or mistakenly think automatic modules have a module-info.class (D), when in fact they are automatically derived from JARs without one.
Detailed technical explanation
How to think about this question
Under the hood, the module path is a new search mechanism that enforces module boundaries, while the class path is treated as the unnamed module. A named module's module-info.java is compiled into a module-info.class file that the JVM reads at startup to enforce encapsulation; if a package is not exported, it is inaccessible to other modules even via reflection. In real-world scenarios, this prevents accidental exposure of internal APIs and enforces strong encapsulation, which is critical for large-scale applications.
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.
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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 module declaration is stored in a file named module-info.java. — Option B is correct because the module declaration in JPMS is indeed stored in a file named module-info.java, which is compiled into module-info.class and placed at the root of the module. This file defines the module's name, dependencies (requires), and exported packages (exports).
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on 1Z0-829
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO statements are true about Java modules in Java 17? (Choose two.)
medium- ✓ A.A module can export a package only to specific modules using 'exports ... to ...'
- ✓ B.The module-info.java file must be compiled with javac and placed in the root of the JAR.
- C.All packages in a module are automatically exported.
- D.The jdeps tool can be used to create a module graph.
- E.The jlink tool creates a JAR file containing the module.
Why A: Option A is correct because the 'exports ... to ...' directive in module-info.java restricts the exported package to only the specified target modules, providing fine-grained access control. This is a key feature of the Java module system introduced in Java 9, allowing a module to expose its packages only to trusted modules rather than all other modules.
Variation 2. Which TWO statements are true about the Java module system (JPMS) as of Java 17?
medium- ✓ A.A named module is defined by a module-info.class file placed in the root of the module.
- B.An automatic module can contain a module-info.class file.
- C.A jar file placed on the classpath that lacks module-info.class becomes an automatic module.
- D.A named module can read an unnamed module by default.
- ✓ E.An unnamed module is created when code is placed on the classpath.
Why A: Option A is correct because a named module in JPMS is defined by a module-info.class file (compiled from module-info.java) placed in the root directory of the module. This file declares the module's name, dependencies, and exported packages, making it a fundamental requirement for a named module.
Variation 3. Which TWO statements about Java module types are true?
medium- ✓ A.An automatic module exports all its packages.
- B.An automatic module can access all packages of named modules without explicit requires.
- C.The unnamed module can read only the java.base module.
- ✓ D.A named module requires a module-info.java file at compile time.
- E.The unnamed module is a named module.
Why A: Option A is correct because the Java module system automatically exports all packages of an automatic module, making them accessible to other modules without explicit export declarations. This is a key characteristic of automatic modules, which are created from JAR files placed on the module path without a module-info.java file.
Last reviewed: Jun 11, 2026
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