1Z0-829 Java Platform Overview and Packaging Practice Question
A developer creates a Java application that uses the new 'jpackage' tool to create an installer for Windows. The application is modular and has a main class declared in module-info. Which option is required to specify the main class when using jpackage?
⚠ Common exam trap
Many candidates confuse `--module` with `--module-path` or `--main-jar`, mistakenly thinking the main class must be specified via a JAR or classpath even when the module system already declares it.
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
✓
--module
For a modular application with a main class declared in module-info, jpackage requires the `--module` option to specify the module name and, optionally, the main class (e.g., `--module com.example/com.example.Main`). This is because jpackage uses the module system to resolve the entry point, not a classpath or JAR-based approach.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
-classpath
Why it's wrong here
classpath is not used with jpackage; the tool uses module path.
- ✗
--module-path
Why it's wrong here
--module-path specifies locations of modules, but does not identify the main class.
- ✗
--main-jar
Why it's wrong here
--main-jar is used for non-modular applications packaged as a jar with a Main-Class attribute.
- ✓
--module
Why this is correct
For modular applications, jpackage uses --module to specify the main module, and the application's main class is derived from the module descriptor.
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