Exclude empty Arrays from Jackson ObjectMapper

You should use:

config.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);

for Jackson 1 or

config.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

for Jackson 2

If you can modify the object to be serialized, you can also place an annotation directly on the field, for example (Jackson 2.11.2):

@JsonProperty
@JsonInclude(JsonInclude.Include.NON_EMPTY)
private Set<String> mySet = new HashSet<>();

In this way, no further configuration of the ObjectMapper is required.

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