Quick Answer
The answer is `jlink`, the Java tool designed to create a custom runtime image. It is correct because `jlink` links only the specified application modules and their transitive dependencies into a minimal JRE, stripping out unused modules to reduce the distribution footprint. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of the Java module system and the `jlink` tool for optimizing deployment—a common trap is confusing `jlink` with `jpackage` (which packages the image into an installer) or `jmod` (which creates modular JARs). Remember that `jlink` is the linker: it takes your modular application and produces a lean, self-contained runtime. A helpful memory tip is to think of "link" as in "linking only what you need"—if your app uses five modules, `jlink` gives you a JRE with just those five, not the entire JDK.
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 developer has created a modular Java application. They want to distribute a minimal runtime image containing only the required modules. Which tool should they use?
javac
Why wrong: javac is the Java compiler, not used for creating runtime images.
jlink
jlink creates a custom runtime image with only required modules.
jar
Why wrong: jar is used to create JAR files, not runtime images.
jpackage
Why wrong: jpackage creates native installers, not minimal runtime images.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
jlink
B is correct because `jlink` is the Java tool specifically designed to assemble and optimize a minimal runtime image containing only the modules explicitly required by the application and its transitive dependencies. It links the specified modules and their dependencies into a custom JRE that excludes unused modules, reducing footprint for distribution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
javac
Why it's wrong here
javac is the Java compiler, not used for creating runtime images.
jlink
Why this is correct
jlink creates a custom runtime image with only required modules.
Related concept
Read the scenario before looking for a memorised answer.
jar
Why it's wrong here
jar is used to create JAR files, not runtime images.
jpackage
Why it's wrong here
jpackage creates native installers, not minimal runtime images.
Common exam traps
The trap here is that candidates confuse `jpackage` (which creates installers) with `jlink` (which creates the runtime image), or assume `jar` can produce a runnable image because it can create executable JARs with a manifest.
Detailed technical explanation
Under the hood, `jlink` uses the module graph resolved by the module system (JPMS) to determine exactly which modules are needed, then strips out all other modules from the JDK's `jmods` directory. It also applies optimizations like `--compress` and `--strip-debug` to reduce image size, and can produce a custom `java.base` module with only the required classes. In real-world scenarios, this is critical for cloud-native or containerized deployments where a full JDK would waste memory and storage.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Java Platform Overview and Packaging — This question tests Java Platform Overview and Packaging — Read the scenario before looking for a memorised answer..
The correct answer is: jlink — B is correct because `jlink` is the Java tool specifically designed to assemble and optimize a minimal runtime image containing only the modules explicitly required by the application and its transitive dependencies. It links the specified modules and their dependencies into a custom JRE that excludes unused modules, reducing footprint for distribution.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. A development team wants to ensure that a Java 17 application runs with a specific set of modules. They want to minimize the footprint by including only necessary modules. Which tool should they use?
mediumWhy B: B is correct because jlink is the Java tool specifically designed to assemble and optimize a custom runtime image containing only the modules explicitly required by an application. It analyzes module dependencies and produces a minimal JRE, reducing footprint by excluding unused modules, which aligns with the team's goal of minimizing size.
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Last reviewed: Jun 25, 2026
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