Question 387 of 513
1Z0-829 Java I/O API and Securing Applications Practice Question
An application deserializes objects from a network stream. To protect against deserialization attacks, which approach is most effective in Java 17?
⚠ Common exam trap
Oracle often tests the misconception that making fields transient or closing streams properly is sufficient to prevent deserialization attacks, when in reality the core vulnerability lies in the deserialization process itself, which must be actively filtered.
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
✓
Set an ObjectInputFilter on the ObjectInputStream
Setting an ObjectInputFilter on the ObjectInputStream allows you to define a filter that can reject deserialization of arbitrary or malicious classes, which is the primary defense against deserialization attacks. This mechanism, introduced in Java 9 and enhanced in later versions, lets you whitelist or blacklist classes based on patterns, limits on array sizes, or depth of object graphs, directly mitigating the risk of remote code execution or denial-of-service via crafted serialized data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Declare all fields as transient
Why it's wrong here
Transient prevents serialization of those fields but does not filter incoming objects.
- ✓
Set an ObjectInputFilter on the ObjectInputStream
Why this is correct
Allows rejection of classes based on criteria, preventing attacks.
- ✗
Use try-with-resources to auto-close the stream
Why it's wrong here
Resource management alone does not filter deserialized objects.
- ✗
Mark the class as final
Why it's wrong here
Prevents subclassing but does not restrict deserialization of instances.
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Last reviewed: Jun 30, 2026
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