1Z0-829 Java Platform Overview and Packaging Practice Question
Exhibit
Refer to the exhibit. ``` Error: Unable to initialize main class com.example.Main Caused by: java.lang.module.ResolutionException: Module com.example.app not found ```
A developer receives the above error when running a modular Java application. What is the most likely cause?
⚠ Common exam trap
A common mix-up: candidates confuse module path errors with classpath errors, assuming a missing class is the issue, when in fact the module system requires the entire module to be present on the module path.
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
✓
The module 'com.example.app' is not on the module path.
When a modular Java application throws an error indicating that a module cannot be found, the most common cause is that the module's JAR or directory is not present on the module path. The module path is specified using the `--module-path` option (or `-p`) when launching the application with `java --module`. If `com.example.app` is not on that path, the module system cannot resolve it, leading to a `ModuleNotFoundException` or similar error.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The module-info.java has a syntax error.
Why it's wrong here
A syntax error would be caught at compile time.
- ✓
The module 'com.example.app' is not on the module path.
Why this is correct
The error indicates the module was not found.
- ✗
The JRE version is too old.
Why it's wrong here
If the JRE were too old, it would not support modules at all.
- ✗
The main class is misspelled.
Why it's wrong here
That would cause a different error (ClassNotFoundException).
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