- A
Restrict the codebase URLs in policy files to only trusted code locations.
Limiting which code can be granted privileges reduces attack surface.
- B
Use SubjectDomainCombiner to merge multiple protection domains.
Why wrong: SubjectDomainCombiner is for combining subjects, not directly for preventing privilege escalation.
- C
Always use a SecurityManager to enforce the policy.
Why wrong: SecurityManager is a framework but does not by itself prevent escalation; proper policy configuration is needed.
- D
Sign JARs and verify signatures to ensure code integrity.
Code signing prevents tampering and ensures trusted origin.
- E
Use AccessController.checkPermission to explicitly check permissions before privileged operations.
Explicit permission checks reduce the risk of unintended privileged actions.
Quick Answer
The answer is restricting codebase URLs in policy files to only trusted code locations. This is correct because it directly limits the sources from which privileged code can be loaded, preventing an attacker from injecting malicious code from an untrusted URL that could otherwise be granted elevated permissions via doPrivileged. By narrowing the codebase, you reduce the attack surface for privilege escalation attacks, which is a core security principle tested on the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam. This topic often appears in questions about the AccessController and doPrivileged mechanism, where a common trap is assuming that granting broad permissions in the policy file is safe—it is not, as it opens the door to untrusted code gaining elevated access. Remember the mnemonic: "Restrict the source, block the force" to recall that limiting codebase URLs is your first line of defense against privilege escalation.
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. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which THREE are recommended practices to prevent privilege escalation when using doPrivileged in a security-sensitive Java application?
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
Restrict the codebase URLs in policy files to only trusted code locations.
Option A is correct because restricting codebase URLs in policy files to only trusted code locations limits the sources from which privileged code can be loaded. This prevents an attacker from injecting malicious code from an untrusted URL that could otherwise be granted elevated permissions via doPrivileged. By narrowing the codebase, you reduce the attack surface for privilege escalation attacks.
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.
- ✓
Restrict the codebase URLs in policy files to only trusted code locations.
Why this is correct
Limiting which code can be granted privileges reduces attack surface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use SubjectDomainCombiner to merge multiple protection domains.
Why it's wrong here
SubjectDomainCombiner is for combining subjects, not directly for preventing privilege escalation.
- ✗
Always use a SecurityManager to enforce the policy.
Why it's wrong here
SecurityManager is a framework but does not by itself prevent escalation; proper policy configuration is needed.
- ✓
Sign JARs and verify signatures to ensure code integrity.
Why this is correct
Code signing prevents tampering and ensures trusted origin.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use AccessController.checkPermission to explicitly check permissions before privileged operations.
Why this is correct
Explicit permission checks reduce the risk of unintended privileged actions.
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 often confuse the mechanism (SecurityManager) with a preventive practice, or think that SubjectDomainCombiner is a security control when it actually aggregates permissions and can inadvertently widen the privilege scope.
Detailed technical explanation
How to think about this question
Under the hood, doPrivileged works by temporarily enabling a privileged action that bypasses the normal stack inspection in AccessController. Restricting codebase URLs ensures that only JARs from specific, trusted origins (e.g., signed with a known certificate) can be granted AllPermission or other sensitive permissions. In real-world scenarios, an attacker could host a malicious JAR on an untrusted URL; if that URL is listed in the policy file, the code could execute with elevated privileges, leading to privilege escalation.
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.
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
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: Restrict the codebase URLs in policy files to only trusted code locations. — Option A is correct because restricting codebase URLs in policy files to only trusted code locations limits the sources from which privileged code can be loaded. This prevents an attacker from injecting malicious code from an untrusted URL that could otherwise be granted elevated permissions via doPrivileged. By narrowing the codebase, you reduce the attack surface for privilege escalation attacks.
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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Last reviewed: Jun 25, 2026
This 1Z0-829 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-829 exam.
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