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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
grant codeBase "file:${user.home}/lib/*" {
permission java.io.FilePermission "${user.home}/config.ini", "read";
permission java.io.FilePermission "${user.home}/logs/-", "read,write";
// Missing permission for data files
};
grant codeBase "file:/app/lib/app.jar" {
permission java.security.AllPermission;
};
Refer to the exhibit. A security policy file is configured as shown. The application in app.jar tries to read a file named "${user.home}/data/db.properties". What is the result?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Access is allowed because app.jar has AllPermission.
Option D is correct because the security policy grants AllPermission to app.jar, which supersedes any specific file permissions. AllPermission implies every possible permission, including read access to any file, regardless of path restrictions. Therefore, the application can read '${user.home}/data/db.properties' without denial.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Access is denied because the FilePermission for data files is missing.
Why it's wrong here
The first grant does not cover app.jar.
✗
Access is denied because app.jar's AllPermission is not sufficient.
Why it's wrong here
AllPermission grants everything.
✗
Access is allowed because the first grant includes read permission for logs/-, which covers data.
Why it's wrong here
logs/- does not include data/.
✓
Access is allowed because app.jar has AllPermission.
Why this is correct
AllPermission overrides any restrictions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on the specific FilePermission grants and miss that AllPermission in the second grant renders all other permission checks irrelevant, leading them to incorrectly choose options based on path mismatches.
Detailed technical explanation
How to think about this question
In the Java security policy, permissions are evaluated using the principle of 'implied permissions' — a permission is implied if it is a superset of the required permission. AllPermission implies every other permission, including FilePermission for any path. The policy file uses a property expansion syntax (${user.home}) which is resolved at runtime by the Policy implementation, but AllPermission bypasses all path-specific checks entirely. This is critical in real-world scenarios where granting AllPermission to untrusted code is a security risk, as it disables the sandbox.
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: Access is allowed because app.jar has AllPermission. — Option D is correct because the security policy grants AllPermission to app.jar, which supersedes any specific file permissions. AllPermission implies every possible permission, including read access to any file, regardless of path restrictions. Therefore, the application can read '${user.home}/data/db.properties' without denial.
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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