title: How the map is serialized? (Java)
body: <p>I use Jackson (ObjectMapper) to serialize some objects to string (json representation). Object example:</p>
  <pre><code>{
    &quot;name&quot;: &quot;test_name&quot;,
    &quot;test_map_key&quot;: {                     &lt;---- Map&lt;String, List&lt;String&gt;&gt;
       &quot;key_map&quot;: [&quot;value1&quot;,&quot;value2&quot;]   
    }
  }
  </code></pre>
  <p>Json representation should be like above, but what I've got using <strong>mapper.writeValueAsString(myObject)</strong></p>
  <pre><code>{
      &quot;name&quot;: &quot;test_name&quot;,
      &quot;key_map&quot;: [&quot;value1&quot;,&quot;value2&quot;]
  }
  </code></pre>
  <p>The 'test_map_key' is disappear and was taken internal key taken as a field. Is it possible to fix? Maybe someone paces this?</p>