Prevent Jackson from serializing a float as a double

Question

Jackson seems to be coercing all floats into doubles in any data structure that I am trying to serialize into JSON. Is there any way to avoid this behavior?

Float f = 50.1f;
System.out.println(f);                                 // 50.1
System.out.println(f.doubleValue());                   // 50.099998474121094
System.out.println(new ObjectMapper().valueToTree(f)); // 50.099998474121094 -- how to prevent this?

Using jackson-all-1.9.11.jar.

By the way, why Jackson 1.9.x? The current version is 2.2.x... — fge, Jun 13 '13 at 07:02
Did you try using [FloatSerializer](http://fasterxml.github.io/jackson-databind/javadoc/2.2.0/com/fasterxml/jackson/databind/ser/std/NumberSerializers.FloatSerializer.html) ? — AllTooSir, Jun 13 '13 at 07:14
@fge Working within a massive codebase. Can't easily upgrade. — Chiraag Mundhe, Jun 13 '13 at 07:20
@TheNewIdiot Thanks. That will definitely work, as will new ObjectMapper().writeValueAsString(), apparently. — Chiraag Mundhe, Jun 13 '13 at 07:21

score 0 · Answer 1 · edited May 23 '17 at 11:46

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You can use the custom Jackson serializer of your own as described in this link

Java to Jackson JSON serialization: Money fields

edited May 23 '17 at 11:46

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answered May 27 '16 at 01:11

Santhosh Gandhe

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Prevent Jackson from serializing a float as a double

1 Answers1