The answer is that the `--add-modules` option was not specified for `java.sql`, so it is not included in the runtime image. This is correct because `jlink` only packages modules explicitly listed with `--add-modules` along with their transitive dependencies; since the command only adds the `app` module and `app` does not require `java.sql`, the `java.sql` module is missing from the resulting image. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this tests your understanding of `jlink`’s module resolution behavior—a common trap is assuming that any module used by the application will be automatically included, when in fact `jlink` is strict about explicit inclusion. Remember the memory tip: "jlink is a linker, not a guesser—if you don't name it, it won't frame it."
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 Java developer is building a modular application that uses only the `java.base` and `java.sql` modules. The application runs correctly with a full JDK 17 installation. The developer wants to distribute a minimal runtime image to reduce download size for end users. They have the application module JAR file and all dependencies are modular. The developer runs the command `jlink --module-path $JAVA_HOME/jmods:app --add-modules app --output myimage` but receives an error: "Error: java.sql module not found". What is the most likely cause of this error?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The `--add-modules` option was not specified for `java.sql`, so it is not included in the runtime image.
Option D is correct because `jlink` only includes modules explicitly specified with `--add-modules` (plus their transitive dependencies) in the runtime image. The command only specifies `--add-modules app`, so `java.sql` is not included unless `app` requires it. Since the error says 'java.sql module not found', the most likely cause is that `java.sql` was not listed in `--add-modules` and is not a transitive dependency of `app`.
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 `--add-modules` option can only be used with root modules, but `java.sql` is not a root module.
Why it's wrong here
`--add-modules` can add any module, not just root modules.
✗
The `java.sql` module is not a standard JDK module and must be compiled separately.
Why it's wrong here
`java.sql` is a standard module included in the JDK.
✗
The module path is missing the application's output directory.
Why it's wrong here
The module path includes both $JAVA_HOME/jmods and the app directory, which should contain the module JAR.
✓
The `--add-modules` option was not specified for `java.sql`, so it is not included in the runtime image.
Why this is correct
jlink only includes modules explicitly listed with `--add-modules` and their transitive dependencies. Since `java.sql` is not added, it is missing.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `jlink` automatically includes all JDK modules present in the module path, but it only includes those explicitly requested or required by the specified root modules.
Detailed technical explanation
How to think about this question
`jlink` creates a custom runtime image by resolving modules from the module path starting from the root modules specified with `--add-modules`. If `java.sql` is not a transitive dependency of `app`, it must be explicitly added. The `--add-modules` option accepts a comma-separated list of module names; omitting `java.sql` causes the linker to skip it, leading to the 'module not found' error if the application code references it at runtime.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 `--add-modules` option was not specified for `java.sql`, so it is not included in the runtime image. — Option D is correct because `jlink` only includes modules explicitly specified with `--add-modules` (plus their transitive dependencies) in the runtime image. The command only specifies `--add-modules app`, so `java.sql` is not included unless `app` requires it. Since the error says 'java.sql module not found', the most likely cause is that `java.sql` was not listed in `--add-modules` and is not a transitive dependency of `app`.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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. A developer runs 'java --list-modules' and sees the output above. Which command can be used to create a custom runtime image containing only the 'java.base' module?
Why D: The `jlink` tool is used to assemble and optimize a set of modules and their dependencies into a custom runtime image. The `--add-modules` option specifies which modules to include, and `--output` specifies the target directory. Option D correctly uses `jlink --add-modules java.base --output myimage` to create a runtime image containing only the `java.base` module.
Last reviewed: Jun 25, 2026
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