Quick Answer
The correct answer is requires com.example.app; because the requires directive in module-info.java is the standard mechanism for declaring a module dependency in the Java Platform Module System (JPMS). When module 'com.example.client' needs to access the exported packages of 'com.example.app', it must explicitly state this dependency using requires, which makes the exported types available at compile time and runtime. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of module dependency declarations, often appearing alongside concepts like transitive dependencies or qualified exports. A common trap is confusing requires with exports—remember that requires is used by the consuming module to declare what it needs, while exports is used by the providing module to expose packages. A helpful memory tip: think of requires as the module saying "I need this," and exports as the module saying "I offer this."
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.
A developer has a module named 'com.example.app' that exports a package 'com.example.api'. Another module 'com.example.client' requires 'com.example.app'. Which directive must be in the module-info.java of 'com.example.client'?
opens com.example.app;
Why wrong: 'opens' is for reflective access.
uses com.example.api;
Why wrong: 'uses' is for service interfaces.
exports com.example.api;
Why wrong: Exports are used in the providing module, not the client.
requires com.example.app;
This correctly declares the dependency.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
requires com.example.app;
Option D is correct because the 'requires' directive in a module-info.java file declares a dependency on another module. For 'com.example.client' to access the exported packages of 'com.example.app', it must include 'requires com.example.app;'. This is the standard mechanism for module dependency in the Java Platform Module System (JPMS).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
opens com.example.app;
Why it's wrong here
'opens' is for reflective access.
uses com.example.api;
Why it's wrong here
'uses' is for service interfaces.
exports com.example.api;
Why it's wrong here
Exports are used in the providing module, not the client.
requires com.example.app;
Why this is correct
This correctly declares the dependency.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse 'requires' with 'exports' or 'opens', mistakenly thinking that the client module must export or open the server module's package, rather than simply declaring a dependency.
Detailed technical explanation
Under the hood, the 'requires' directive establishes a readability relationship between modules, which is enforced at both compile time and runtime by the JPMS. Without this directive, the compiler will reject any reference to types from 'com.example.app', even if they are exported. In real-world scenarios, forgetting 'requires' is a common cause of 'package is not visible' errors, especially when migrating from the classpath to the module path.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Java Platform Overview and Packaging — This question tests Java Platform Overview and Packaging — Read the scenario before looking for a memorised answer..
The correct answer is: requires com.example.app; — Option D is correct because the 'requires' directive in a module-info.java file declares a dependency on another module. For 'com.example.client' to access the exported packages of 'com.example.app', it must include 'requires com.example.app;'. This is the standard mechanism for module dependency in the Java Platform Module System (JPMS).
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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