1Z0-829 Java Platform Overview and Packaging Practice Question
In a modular Java application, where does the module declaration file typically reside?
⚠ Common exam trap
Many exam-takers confuse the source file location (`module-info.java` at the root of the source tree) with the compiled output (`module-info.class` in the output directory), or mistakenly think it belongs in `META-INF` due to familiarity with JAR metadata.
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
✓
In a file named module-info.java at the root of the module's source tree
The module declaration for a modular Java application must be placed in a file named `module-info.java` at the root of the module's source tree. This file is then compiled into `module-info.class` and placed in the output directory, but the source declaration resides in the source tree root as per the Java Platform Module System (JPMS) specification.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
In a file named module-info.class in the output directory
Why it's wrong here
module-info.class is the compiled form, not the source declaration.
- ✗
In the META-INF directory
Why it's wrong here
META-INF is for metadata like MANIFEST.MF, not module declarations.
- ✓
In a file named module-info.java at the root of the module's source tree
Why this is correct
module-info.java is placed at the root of each module source tree.
- ✗
In the root of the source directory
Why it's wrong here
The root of the source directory is for the entire project, not per module.
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