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Java I/O API and Securing ApplicationseasyMultiple ChoiceObjective-mapped

1Z0-829 Java I/O API and Securing Applications Practice Question

Which interface should be implemented to create a custom filter for deserialization in Java?

⚠ Common exam trap

Test-takers frequently confuse `ObjectInputFilter` with `Serializable` or stream-level filters like `FilterOutputStream`, missing that the question specifically asks for a filter on the deserialization process itself.

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

ObjectInputFilter

The `ObjectInputFilter` interface (introduced in Java 9) allows you to define a custom filter that validates classes and data being deserialized from an `ObjectInputStream`. By implementing this interface, you can reject potentially malicious or unexpected classes during deserialization, which is a key security measure against deserialization attacks.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ObjectInputFilter

    Why this is correct

    Defines the filter to accept or reject classes during deserialization.

  • Serializable

    Why it's wrong here

    Only marks a class as serializable.

  • ObjectOutput

    Why it's wrong here

    Interface for object serialization output.

  • FilterOutputStream

    Why it's wrong here

    For filtering output streams, not deserialization.

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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