- A
Create a module-info.java for the application that requires all third-party libraries as automatic modules.
Automatic modules allow backward compatibility; the application can declare requires on the library names derived from JAR names.
- B
Place all third-party JARs on the classpath and the application JARs on the module path.
Why wrong: Mixing classpath and module path can cause access issues and is not a recommended migration strategy.
- C
Place all JARs on the module path and use the --add-reads and --add-exports flags to resolve dependencies.
Why wrong: This approach is cumbersome and only suitable for temporary workarounds, not for a clean migration.
- D
Use the jlink tool to create a custom runtime image that includes all needed modules.
Why wrong: jlink creates a runtime image but does not help with modularizing the source code or libraries.
Quick Answer
The correct answer is to create a module-info.java for the application that requires all third-party libraries as automatic modules. This approach works because JPMS automatically treats any JAR placed on the module path that lacks a module-info.class as an automatic module, which exports all its packages and reads all other modules by default. This allows your modularized application to declare dependencies on these libraries cleanly without modifying the third-party code. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of how JPMS handles non-modular jars during migration, and the common trap is thinking you can mix classpath and module path safely—doing so creates split-package and class-loading issues. A helpful memory tip: think of automatic modules as a “bridge” that lets legacy JARs cross into the module system without needing their own 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.
A company has a legacy application consisting of multiple JAR files that run on Java 11. They plan to migrate to Java 17 and modularize the application using JPMS. However, some third-party libraries do not provide module-info.class files. What is the best approach to ensure the application can be modularized while maintaining compatibility with these libraries?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Create a module-info.java for the application that requires all third-party libraries as automatic modules.
Option B is correct because creating a module-info.java that requires the third-party libraries as automatic modules (by placing them on the module path) allows the application to be modular while using libraries without module-info. Option A is wrong because mixing classpath and module path can lead to class-loading inconsistencies and is not recommended. Option C is wrong because using --add-reads and --add-exports for all libraries is verbose and error-prone. Option D is wrong because jlink creates a runtime image but does not solve the modularization of dependencies.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a module-info.java for the application that requires all third-party libraries as automatic modules.
Why this is correct
Automatic modules allow backward compatibility; the application can declare requires on the library names derived from JAR names.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Place all third-party JARs on the classpath and the application JARs on the module path.
Why it's wrong here
Mixing classpath and module path can cause access issues and is not a recommended migration strategy.
- ✗
Place all JARs on the module path and use the --add-reads and --add-exports flags to resolve dependencies.
Why it's wrong here
This approach is cumbersome and only suitable for temporary workarounds, not for a clean migration.
- ✗
Use the jlink tool to create a custom runtime image that includes all needed modules.
Why it's wrong here
jlink creates a runtime image but does not help with modularizing the source code or libraries.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 1Z0-829 NAT questions on configuration and troubleshooting.
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Java Platform Overview and Packaging — study guide chapter
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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 — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a module-info.java for the application that requires all third-party libraries as automatic modules. — Option B is correct because creating a module-info.java that requires the third-party libraries as automatic modules (by placing them on the module path) allows the application to be modular while using libraries without module-info. Option A is wrong because mixing classpath and module path can lead to class-loading inconsistencies and is not recommended. Option C is wrong because using --add-reads and --add-exports for all libraries is verbose and error-prone. Option D is wrong because jlink creates a runtime image but does not solve the modularization of dependencies.
What should I do if I get this 1Z0-829 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 1Z0-829 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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