Question 170 of 513
1Z0-829 Java Platform Overview and Packaging Practice Question
A team is developing a large enterprise application using Java 17. The application consists of multiple modules: core (provides logging and configuration), services (business logic), and web (REST endpoints). The modules are packaged as separate JAR files and deployed on a server. During runtime, the web module throws a java.lang.ClassNotFoundException for a class that is part of the core module. The core module's module-info.java exports the package containing the missing class. The web module's module-info.java requires core. However, the services module also needs the same class but uses a different version of it, causing conflicts. The team decides to use the class path for the conflicting package and the module path for the rest. They add the conflicting JAR to the class path and keep the other JARs on the module path. After this change, the web module still cannot find the class, but the services module works fine. What is the most likely cause of the issue?
⚠ Common exam trap
Test-takers frequently think the issue is about module visibility (exports) or class path scanning order, but the real constraint is the split package rule, which prevents a named module from accessing a package that is already defined by another named module 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 web module is a named module and cannot access classes from a split package that is also in the unnamed module.
When a named module (the web module) is on the module path, it cannot access classes from the unnamed module (the class path) if those classes belong to a package that is also exported by another named module on the module path. This creates a split package, which is forbidden by the Java module system. The core module exports the package, so the web module cannot load the class from the class path JAR, resulting in ClassNotFoundException.
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 services module is using an automatic module, which automatically reads the unnamed module, while the web module is a named module that does not.
Why it's wrong here
Even if the services module were automatic, the web module being named still cannot access the class path package if it is split.
- ✗
The class path is not scanned for JAR files unless the module path is empty.
Why it's wrong here
The class path is always scanned for classes, but named modules cannot access classes from the class path if the package is split.
- ✓
The web module is a named module and cannot access classes from a split package that is also in the unnamed module.
Why this is correct
The module system prevents named modules from accessing split packages from the class path to maintain reliable configuration.
- ✗
The core module's module-info.java does not export the package to the web module; it only exports it to all modules.
Why it's wrong here
The export to all modules should allow the web module to access it, but the issue is the split package, not the export.
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Last reviewed: Jun 11, 2026
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