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2013-03-15T09:21:01.447
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2018-02-09T15:17:19.227
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2018-02-09T15:17:19.227
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If you can change your original model with Jackson annotations, here is the way how to achieve this. Jackson has <a href="https://github.com/FasterXML/jackson-databind/wiki/Serialization-Features" rel="nofollow noreferrer">WRITE_EMPTY_JSON_ARRAYS</a>. And you may turn off it with: <pre><code>objectMapper.configure(SerializationConfig.Feature.WRITE_EMPTY_JSON_ARRAYS, false); </code></pre> But it works only for <code>Arrays</code>, but not for <code>Collections</code>. But you may combine <code>@JsonProperty</code> with <code>@JsonIgnore</code>, something like the following: <pre><code>//....getter, setter of Person class @JsonIgnore public List<Event> getEvents() { return events; } @JsonProperty("events") public Event[] getEventsArr() { return events.toArray(new Event[0]); } </code></pre> And afterwards you'll have output, as you expected. EDIT: If you are using SpringMVC, then you can configure your actual <code>ObjectMapper</code> with explicit reference in <code>mvc:annotation-driven</code>: <pre><code> <mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="objectMapper" ref="objectMapper"/> </bean> </mvc:message-converters> </mvc:annotation-driven>  <bean name="objectMapper" class="org.springframework.http.converter.json.JacksonObjectMapperFactoryBean" autowire="no"> <property name="featuresToDisable"> <list>  <value type="org.codehaus.jackson.map.SerializationConfig.Feature">WRITE_EMPTY_JSON_ARRAYS</value> </list> </property> </bean> </code></pre> Offtop: usually it's quite useful to specify explicit instance of <code>ObjectMapper</code>, because: <ul> <li>you can configure it in the way you want</li> <li>you can use its reference through <code>@Autowired</code></li> </ul>
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