CODEWITHSUNDEEP
javajsonjackson
anoopelias
anoopelias

Reputation: 9548

Jackson Convert Object to Map preserving Date type

I am using Jackson ObjectMapper to convert a Java Bean to a Map.

However, it is not preserving the Date object, rather it gets converted to Long.

Here is the failing test case,

@Test
public void testObjectToMapDate() {

    User user = new User();
    user.setDob(new Date());

    ObjectMapper mapper = new ObjectMapper();
    Map<String, Object> map = mapper.convertValue(user, Map.class);
    assertTrue(map.get("dob") instanceof Date);

}

Is there a simple solution to this?

Upvotes: 10

Views: 13222

Answers (1)

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 279960

Jackson, by default, serializes java.util.Date instances as numeric timestamps. You can configure Jackson to use a textual representation with

mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); // it's true by default

or provide your own JsonSerializer.

However, when you are doing the conversion, there is absolutely nothing in the intermediate JSON and in the target type, Map, to indicate to Jackson that it should deserialize it as a Date object. Without extra type information, Jackson will always deserialize it using its defaults (long, double, String, LinkedHashMap).

Upvotes: 15

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