1Z0-829 Java Platform Overview and Packaging Practice Question
Which TWO are valid uses of the 'jmod' tool in Java 17?
⚠ Common exam trap
Test-takers frequently confuse the roles of 'jmod' (packaging) with 'jlink' (runtime image creation) and 'jdeps' (dependency analysis), leading candidates to incorrectly assign runtime image creation or dependency analysis to 'jmod'.
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
✓
Listing the contents of a JMOD file.
The 'jmod' tool is primarily used for creating and inspecting JMOD files, which are a packaging format for Java modules that can include native libraries, configuration files, and other resources beyond what a modular JAR can hold. Option B is correct because 'jmod list' lists the contents of a JMOD file, showing its entries such as classes, native code, and legal notices. Option C is correct because 'jmod create' can create a JMOD file from a modular JAR and additional native libraries using the --libs 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.
- ✗
Creating a custom runtime image.
Why it's wrong here
That is the function of jlink.
- ✓
Listing the contents of a JMOD file.
Why this is correct
jmod list command lists contents of a JMOD file.
- ✓
Creating a JMOD file from a modular jar and native libraries.
Why this is correct
jmod create can combine a jar with additional resources into a JMOD file.
- ✗
Executing a JMOD file as an application.
Why it's wrong here
JMOD files are not directly executable.
- ✗
Identifying module dependencies of a jar.
Why it's wrong here
That is the function of jdeps.
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