1Z0-829 Java Platform Overview and Packaging Practice Question
A Java 17 application is packaged as a modular jar and deployed on a system with the full JDK. The application uses the java.sql module. The system administrator wants to minimize the footprint by creating a custom runtime image using jlink. Which command would create an image with only the necessary modules?
⚠ Common exam trap
Many candidates think `--bind-services` is required for modular applications or that explicitly listing `java.sql` is sufficient, but they overlook that the application module itself must be the root for proper dependency resolution.
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
✓
jlink --module-path $JAVA_HOME/jmods:app --add-modules com.myapp --output myimage
`jlink` with `--add-modules com.myapp` and the module path pointing to both `$JAVA_HOME/jmods` and the application JAR automatically resolves all transitive dependencies, including `java.sql`, and creates a minimal runtime image containing only the required modules. The `--output myimage` specifies the target directory for the custom image.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
jlink --module-path $JAVA_HOME/jmods:app --add-modules com.myapp --output myimage
Why this is correct
This adds the application module and its transitive dependencies, including java.sql if required.
- ✗
jlink --module-path $JAVA_HOME/jmods:app --add-modules com.myapp --bind-services --output myimage
Why it's wrong here
Adding --bind-services is not wrong but unnecessary for a basic modular app; still works but not minimal.
- ✗
jlink --module-path $JAVA_HOME/jmods:app --add-modules java.sql --output myimage
Why it's wrong here
This only adds java.sql, not the applications module; the application wont run.
- ✗
jlink --module-path $JAVA_HOME/jmods:app --add-modules ALL-MODULE-PATH --output myimage
Why it's wrong here
ALL-MODULE-PATH includes all modules on the path, making the image larger than necessary.
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