The correct answer is that the module declaration file must reside in a file named module-info.java at the root of the module's source tree. This is mandated by the Java Platform Module System (JPMS) specification, which requires the module descriptor to be placed directly in the source directory for that module, not in any subpackage or nested folder. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of modular source layout and the compilation process—a common trap is assuming module-info.java can be placed inside a package directory like src/com/example, when in fact it must sit at the top level of the module's source root. Remember that the compiler looks for this file as the entry point for defining module dependencies, exports, and opens. A simple memory tip: think of module-info.java as the "front door" of the module—it always stands at the entrance of the source tree, never down a hallway of packages.
1Z0-829 Java Platform Overview and Packaging Practice Question
This 1Z0-829 practice question tests your understanding of java platform overview and packaging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In a modular Java application, where does the module declaration file typically reside?
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
Option C is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
Under the hood, the Java compiler (`javac`) expects `module-info.java` at the root of the source path for each module, and it is compiled into `module-info.class` which is placed in the output directory. This file defines the module's name, dependencies (via `requires`), exported packages (via `exports`), and other directives. A real-world scenario where this matters is when using multi-module builds with tools like Maven or Gradle, where each module must have its own `module-info.java` at the correct location to enforce encapsulation and reliable configuration.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Java Platform Overview and Packaging — This question tests Java Platform Overview and Packaging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: In a file named module-info.java at the root of the module's source tree — Option C is correct because 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.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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