Databases
StackOverflow2013
Postsdbo
POJackson EnumMap key serialization
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJackson EnumMap key serialization
    primarykey
    data
    text
    <p>Does Jackson allow you to customize how it serializes EnumMap keys? For example, if I have</p> <pre><code>public enum MyKey { ABC, DEF, XYZ; public String getKey() { return "my-key-" + ordinal(); } } </code></pre> <p>and some</p> <pre><code>public class MyObject { private final Map&lt;MyKey,String&gt; map = new EnumMap&lt;&gt;(MyKey.class); public MyObject() { map.put(MyKey.ABC, "foo"); map.put(MyKey.DEF, "bar"); map.put(MyKey.XYZ, "baz"); } public Map&lt;MyKey,String&gt; getMap() { return map; } } </code></pre> <p>then Jackson will serialize <code>MyObject</code> as</p> <p><code>{"map":{"ABC":"foo","DEF":"bar","XYZ":"baz"}}</code>.</p> <p>Instead, I want it to serialize it like</p> <p><code>{"map":{"my-key-0":"foo","my-key-1":"bar","my-key-2":"baz"}}</code>. I don't want to override any <code>toString()</code> for this to work. Is this something even possible in Jackson at all?</p> <p>I've tried doing this:</p> <pre><code>public class MyKeySerializer extends JsonSerializer&lt;MyKey&gt; { @Override public void serialize(MyKey value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException { jgen.writeString(value.getKey()); } } </code></pre> <p>then adding</p> <pre><code>public class MyObject { ... @JsonSerialize(keyUsing = MyKeySerializer.class) public Map&lt;MyKey,String&gt; getMap() { return map; } ... } </code></pre> <p>but that fails with a <code>org.codehaus.jackson.JsonGenerationException: Can not write text value, expecting field name</code> exception.</p> <p>Any ideas???</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USManRow
    1. USManRow
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJackson EnumMap key serialization
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POJackson EnumMap key serialization
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POJackson EnumMap key serialization
      1. USDénes
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload