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Learn JSON With Jackson – Module 1 Lesson 3 – Quiz

Last updated: August 27, 2025

Written by: komal

Learn JSON With Jackson
Lesson 3: ObjectMapper Configuration
Learn JSON With Jackson – Module 1 Lesson 3 – Quiz

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Question 1 of 5

1. Question

What is the default behavior of Jackson’s ObjectMapper when serializing an object?

It pretty-prints JSON with indentation and line breaks
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It fails unless all properties are non-null
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It outputs a compact JSON string with fields matching the object attributes
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It always excludes null fields by default
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Question 2 of 5

2. Question

Which ObjectMapper method enables pretty-printing (indented formatting) of JSON output?

enable(SerializationFeature.INDENT_OUTPUT)
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configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
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disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
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setSerializationInclusion(JsonInclude.Include.NON_NULL)
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Question 3 of 5

3. Question

What happens if we disable SerializationFeature.FAIL_ON_EMPTY_BEANS?

The ObjectMapper ignores unknown properties during deserialization
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Jackson outputs {} instead of throwing an exception when serializing empty classes
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Null values are excluded from the output
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Date fields are formatted as ISO-8601 strings
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Question 4 of 5

4. Question

When both global configuration and annotations are present, which takes precedence for a given class or field?

The global ObjectMapper configuration
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The JVM’s default serialization rules
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Neither — whichever was configured last
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Annotations applied at the class or field level
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Question 5 of 5

5. Question

Which ObjectMapper helper method allows you to change how Java property names map to JSON keys (e.g., camelCase to snake_case)?

setVisibility(…)
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setMixIns(…)
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setSerializationInclusion(…)
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setPropertyNamingStrategy(…)
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