The answer is to validate user input before using it in file path construction and to use try-with-resources for automatic resource management. Input validation prevents path traversal and injection attacks by ensuring that user-supplied data cannot manipulate file paths to access unauthorized resources, while try-with-resources guarantees that any opened I/O resource—such as a FileInputStream or BufferedReader—is closed automatically when the block exits, even if an exception occurs, eliminating resource leaks. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this topic tests your understanding of secure coding principles under the broader “I/O” objectives; a common trap is assuming that a finally block with a close() call is equivalent, but try-with-resources is both safer and more concise. Remember the mnemonic “Validate before you navigate, and auto-close to avoid woes.”
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. 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.
Which TWO approaches are recommended to secure Java I/O operations? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use try-with-resources to ensure proper resource closure.
Option A is correct because try-with-resources automatically closes each resource declared in its header when the block exits, whether normally or via exception. This eliminates the risk of resource leaks from forgotten or improperly handled close() calls, which is a fundamental security and reliability requirement for I/O operations.
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.
✓
Use try-with-resources to ensure proper resource closure.
Why this is correct
Ensures file handles are closed, preventing resource exhaustion.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use BufferedInputStream to wrap FileInputStream for better performance.
Why it's wrong here
Improves performance but does not address security.
✗
Use Serializable interface for all data objects.
Why it's wrong here
Doesn't inherently improve security; may introduce deserialization risks.
✗
Use FileLock to prevent concurrent write access.
Why it's wrong here
Prevents concurrent access, but is not a general security practice for I/O.
✓
Validate user input before using it in file path construction.
Why this is correct
Prevents path traversal and injection attacks.
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 performance optimizations (like buffering) or concurrency mechanisms (like FileLock) with security practices, and they may also mistakenly think that serialization is a security measure when it is actually a data format concern with its own security risks.
Detailed technical explanation
How to think about this question
The try-with-resources statement (introduced in Java 7) works by calling the close() method on each resource that implements AutoCloseable, in reverse order of declaration. Under the hood, the compiler generates a hidden finally block that handles exceptions from both the try block and the close() method, using suppressed exceptions to preserve the original failure. In real-world applications, failing to close resources like FileInputStream or Socket can lead to file descriptor exhaustion, which is both a reliability and a denial-of-service security risk.
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: Use try-with-resources to ensure proper resource closure. — Option A is correct because try-with-resources automatically closes each resource declared in its header when the block exits, whether normally or via exception. This eliminates the risk of resource leaks from forgotten or improperly handled close() calls, which is a fundamental security and reliability requirement for I/O operations.
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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