1Z0-829 Java Platform Overview and Packaging Practice Question
A developer places a non-modular JAR file on the module path. What type of module does this JAR become?
⚠ Common exam trap
A common mix-up: candidates confuse the module path with the classpath, mistakenly thinking a non-modular JAR on the module path becomes an unnamed module, when in fact it becomes an automatic module with special privileges like reading all other modules.
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
✓
Automatic module
When a non-modular JAR is placed on the module path, the Java module system automatically derives a module from it, known as an automatic module. This is because the JAR lacks a module-info.class, so the system infers a module name from the JAR filename (e.g., using the Main-Class attribute or the JAR's name) and exports all packages, giving it access to all other modules. Option C is correct because the JAR becomes an automatic module, not a named or unnamed module.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Open module
Why it's wrong here
Open module is a named module that allows deep reflection, not automatically created.
- ✗
Named module
Why it's wrong here
A named module requires a module-info.class.
- ✓
Automatic module
Why this is correct
A JAR on the module path without module-info becomes an automatic module.
- ✗
Unnamed module
Why it's wrong here
The unnamed module is for classes on the classpath.
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