The correct answer is to use the --limit-modules option to restrict jlink to only the application's root modules. This works because jlink normally resolves the entire module graph, including transitive dependencies of all observable modules, which dramatically increases both resolution time and image size. By specifying --limit-modules, you explicitly constrain the module resolution scope to only the modules your application directly requires and their necessary dependencies, skipping the costly analysis of unrelated automatic modules and third-party libraries. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of jlink’s module resolution mechanics and the JPMS—a common trap is confusing compression or stripping with resolution optimization. Remember the memory tip: “Limit the graph, slash the fat”—limiting modules cuts both build time and image size at the source.
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.
A financial trading application is developed using Java 17 and the Java Platform Module System (JPMS). The application consists of 50 named modules, including third-party libraries that are automatic modules. The team uses jlink to create a custom runtime image for deployment on customer servers. They observe that the jlink process takes over 10 minutes and produces an image of 200 MB. They want to reduce both the build time and the image size. Which action would be most effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the --limit-modules option to restrict jlink to only the application's root modules.
Option D is correct because using --limit-modules restricts jlink's module resolution to only the explicitly specified modules and their dependencies, eliminating unnecessary module resolution and reducing the image size. Option A is wrong because --compress only compresses the image after resolution; it does not speed up resolution or significantly reduce the number of modules. Option B is wrong because stripping debug attributes has a minor impact on size and does not affect resolution time. Option C is wrong because jpackage internally uses jlink and does not solve the fundamental issue of resolving too many modules.
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.
✓
Use the --limit-modules option to restrict jlink to only the application's root modules.
Why this is correct
--limit-modules prevents jlink from resolving unnecessary transitive modules, drastically reducing both build time and image size.
Related concept
Static NAT maps one inside address to one outside address.
✗
Replace jlink with jpackage to create a platform-specific installer.
Why it's wrong here
jpackage still uses jlink internally and does not reduce the number of resolved modules.
✗
Use the --strip-java-debug-attributes option to remove debug information.
Why it's wrong here
Stripping debug attributes offers minimal size reduction and does not affect resolution time.
✗
Add the --compress=2 option to the jlink command.
Why it's wrong here
Compression reduces size but does not speed up module resolution, which is a major factor in build time.
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.
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: Use the --limit-modules option to restrict jlink to only the application's root modules. — Option D is correct because using --limit-modules restricts jlink's module resolution to only the explicitly specified modules and their dependencies, eliminating unnecessary module resolution and reducing the image size. Option A is wrong because --compress only compresses the image after resolution; it does not speed up resolution or significantly reduce the number of modules. Option B is wrong because stripping debug attributes has a minor impact on size and does not affect resolution time. Option C is wrong because jpackage internally uses jlink and does not solve the fundamental issue of resolving too many modules.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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