Given the code fragment: How can you apply DateConverter to the birthday field?

Question

Exhibit

Options

• Aby adding @Convert(to=Date.class) at line 3
• Bby invoking the setConverter(DateConverter.class) method on the EntityManager object
• Cby adding @Converter(autoApply=true) at line 1
• Dby adding @Convert((DateConverter.class)) at line 2

• A
  85% (29)
• B
  9% (3)
• C
  3% (1)
• D
  3% (1)

Explanation

Applying @Convert(converter=DateConverter.class) directly on the birthday field (line 3) is the correct JPA approach - it tells the persistence provider to use that specific AttributeConverter implementation when reading/writing that field to the database.

Why the distractors are wrong:

• B is wrong because EntityManager has no setConverter() method; JPA converters are wired declaratively via annotations, not programmatically.
• C is wrong in intent: @Converter(autoApply=true) belongs on the converter class itself (line 1), not the field - and it applies globally to all compatible types, not selectively to birthday.
• D is wrong due to invalid syntax; @Convert requires the named attribute converter=, so the double-parenthesis form @Convert((DateConverter.class)) won't compile.

Memory tip: Distinguish the two annotations by their targets - @Converter (with an r) lives on the converter class to register it; @Convert (no r) lives on the entity field to apply it. If you see "apply to a specific field," always reach for @Convert on the field.

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