Quick Answer
The answer is the `--strip-debug` option. This jlink flag directly removes debugging metadata—such as line numbers, local variable tables, and source file references—from the custom runtime image, which is the most effective way to reduce image size when debug information is not needed. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of jlink’s modular image optimization features; a common trap is confusing `--strip-debug` with the `--compress` option, which handles different types of compression. Remember that `--strip-debug` specifically targets debugging artifacts, not class files or resources. A helpful memory tip: think of “strip” as peeling away debug layers to leave a leaner runtime, just like stripping unnecessary weight from a backpack.
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 uses jlink to create a custom runtime image. They want to reduce the image size by removing debug information. Which jlink option or plugin should they use?
--compress=2
Why wrong: Compresses resources but does not remove debug info.
--strip-debug
Specifically removes debug information to reduce image size.
--no-header-files
Why wrong: Removes header files, not debug info.
--bind-services
Why wrong: Binds service provider classes, unrelated to debug info.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
--strip-debug
The `--strip-debug` option in jlink removes debug information from the custom runtime image, including line numbers, local variable tables, and source file references, which significantly reduces the image size. This is the correct option for stripping debug information, as it directly targets the removal of debugging metadata from the generated image.
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.
--compress=2
Why it's wrong here
Compresses resources but does not remove debug info.
--strip-debug
Why this is correct
Specifically removes debug information to reduce image size.
Related concept
Read the scenario before looking for a memorised answer.
--no-header-files
Why it's wrong here
Removes header files, not debug info.
--bind-services
Why it's wrong here
Binds service provider classes, unrelated to debug info.
Common exam traps
The trap here is that candidates often confuse `--strip-debug` with `--compress=2`, assuming compression removes debug information, but compression only reduces file size without eliminating the underlying debug metadata.
Detailed technical explanation
Under the hood, `--strip-debug` works by invoking the `jdk.jlink.internal.plugins.StripDebugPlugin`, which removes the `SourceFile`, `LineNumberTable`, and `LocalVariableTable` attributes from class files in the image. This is particularly useful for production deployments where debugging is unnecessary, as it can reduce image size by 10–20% or more, depending on the application. A real-world scenario is deploying a microservice in a containerized environment where minimizing image size reduces startup time and storage costs.
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: --strip-debug — The `--strip-debug` option in jlink removes debug information from the custom runtime image, including line numbers, local variable tables, and source file references, which significantly reduces the image size. This is the correct option for stripping debug information, as it directly targets the removal of debugging metadata from the generated image.
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. Which command creates a custom runtime image containing only the modules needed by an application, reducing the size of the JRE?
easyWhy C: The `jlink` tool is specifically designed to create a custom runtime image that contains only the modules required by a given application, along with their transitive dependencies. This reduces the JRE size by eliminating unused modules, which is a key feature of Java's module system (Project Jigsaw). Option C is correct because `jlink` is the only command among the choices that performs this modular runtime image assembly.
Last reviewed: Jun 25, 2026
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