The answer is that a library or caller on the execution stack does not have the required FilePermission. This is because the SecurityManager stack inspection for FilePermission requires every class on the call stack—not just your application’s codebase—to be granted the permission. Even if your own code has the grant in the policy file, any invoked library or framework method lacking it will trigger an AccessControlException. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this tests your understanding of how the SecurityManager performs a full stack walk, a common trap where candidates assume only the immediate caller matters. Remember: the SecurityManager checks the entire chain, not just the origin. A useful memory tip is “all callers must be callers of trust”—every frame on the stack must hold the permission for the check to pass.
1Z0-829 Java I/O API and Securing Applications Practice Question
This 1Z0-829 practice question tests your understanding of java i/o api and securing applications. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are developing a Java application that processes sensitive user data. The application runs on a server with strict security policies. You need to read configuration properties from a file located at /etc/app/config.properties. The application uses a SecurityManager. During testing, you get a security exception: java.security.AccessControlException: access denied (java.io.FilePermission /etc/app/config.properties read). You have already added a file permission grant in the policy file for the application codebase. However, the exception persists. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A library or caller on the execution stack does not have the required FilePermission.
Option B is correct because even if the application's own codebase has the required FilePermission, any library or caller on the execution stack that does not have the permission will cause an AccessControlException. The SecurityManager performs stack inspection: every class on the call stack must have the required permission. If a library or framework method invoked by your code lacks the grant, the check fails.
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.
✗
The application codebase URL in the policy file is incorrect.
Why it's wrong here
It's already granted, so likely correct.
✓
A library or caller on the execution stack does not have the required FilePermission.
Why this is correct
SecurityManager requires all callers in the chain to have permission.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The file path is relative and needs to be resolved against user.dir.
Why it's wrong here
Path is absolute, so no resolution needed.
✗
The policy file is not being loaded because the JVM was not started with -Djava.security.policy.
Why it's wrong here
The policy can be specified via security properties file as well.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume granting permission to the application codebase alone is sufficient, forgetting that the SecurityManager checks all callers on the execution stack, not just the top-level application code.
Detailed technical explanation
How to think about this question
Under the hood, the SecurityManager's checkPermission method calls AccessController.checkPermission, which performs a stack walk from the current frame to the root. Each protection domain on the stack must have the required permission; if any domain lacks it, an AccessControlException is thrown. This is why granting permission only to your application codebase is insufficient if a library (e.g., a logging framework or a configuration library) on the stack does not have the same grant. In real-world scenarios, this often occurs when using third-party libraries that read files internally.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 I/O API and Securing Applications — This question tests Java I/O API and Securing Applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A library or caller on the execution stack does not have the required FilePermission. — Option B is correct because even if the application's own codebase has the required FilePermission, any library or caller on the execution stack that does not have the permission will cause an AccessControlException. The SecurityManager performs stack inspection: every class on the call stack must have the required permission. If a library or framework method invoked by your code lacks the grant, the check fails.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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