1Z0-829 Java I/O API and Securing Applications Practice Question
Which TWO approaches are recommended to secure Java I/O operations? (Choose two.)
⚠ Common exam trap
Many exam-takers 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.
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
✓
Use try-with-resources to ensure proper resource closure.
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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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