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  1. JBoss Enterprise Application Platform
  2. JBEAP-22263

[GSS](7.4.z) Serialization of a Map fails if the key uses a custom Serializer

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      Use an adapter for the map:

      public class LocaleJsonbAdapter implements JsonbAdapter<Map<Locale, String>, Map<String, String>> {
    @Override
    public Map<String, String> adaptToJson(final Map<Locale, String> obj) throws Exception {
        final Map<String, String> copy = new LinkedHashMap<>();
        for (Map.Entry<Locale, String> entry : obj.entrySet()) {
            copy.put(entry.getKey().toLanguageTag(), entry.getValue());
        }
        return copy;
    }

    @Override
    public Map<Locale, String> adaptFromJson(final Map<String, String> obj) throws Exception {
        final Map<Locale, String> copy = new LinkedHashMap<>();
        for (Map.Entry<String, String> entry : obj.entrySet()) {
            copy.put(Locale.forLanguageTag(entry.getKey()), entry.getValue());
        }
        return copy;
    }
}
      Show
      Use an adapter for the map: public class LocaleJsonbAdapter implements JsonbAdapter<Map<Locale, String >, Map< String , String >> { @Override public Map< String , String > adaptToJson( final Map<Locale, String > obj) throws Exception { final Map< String , String > copy = new LinkedHashMap<>(); for (Map.Entry<Locale, String > entry : obj.entrySet()) { copy.put(entry.getKey().toLanguageTag(), entry.getValue()); } return copy; } @Override public Map<Locale, String > adaptFromJson( final Map< String , String > obj) throws Exception { final Map<Locale, String > copy = new LinkedHashMap<>(); for (Map.Entry< String , String > entry : obj.entrySet()) { copy.put(Locale.forLanguageTag(entry.getKey()), entry.getValue()); } return copy; } }
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      With the attached maven project just execute test on it:

      unzip issue-map-locale-key.zip
cd issue-map-locale-key
mvn clean test
      Show
      With the attached maven project just execute test on it: unzip issue-map-locale-key.zip cd issue-map-locale-key mvn clean test

      If you define a custom Serializer for a Locale object like the following:

          public static class LocaleSerializer implements JsonbSerializer<Locale> {
        @Override
        public void serialize(Locale obj, JsonGenerator generator, SerializationContext ctx) {
            generator.write(obj.toLanguageTag());
        }
    }

      And use a Pojo class that contains a Map field with Locale as the key:

      public class TestObject {
  private Map<Locale, String> localeKeyMap;
  ...
}

      If you try to serialize it with current yasson (version 2.0.2 or 1.0.9 included in EAP), like the following code:

              Jsonb jsonb = JsonbBuilder.create(new JsonbConfig()
                .withSerializers(new LocaleSerializer())
                .withDeserializers(new LocaleDeserializer()));
        TestObject o = new TestObject();
        o.getLocaleKeyMap().put(Locale.US, "us");
        jsonb.toJson(o);

      The following exception is thrown:

      jakarta.json.bind.JsonbException: Unable to serialize property 'values' from test.MapObjectTest.MapObjectLocaleString
	at org.eclipse.yasson.internal.serializer.ObjectSerializer.serializeInternal(ObjectSerializer.java:71)
	at org.eclipse.yasson.internal.serializer.AbstractContainerSerializer.serialize(AbstractContainerSerializer.java:107)
	at org.eclipse.yasson.internal.Marshaller.serializeRoot(Marshaller.java:147)
	at org.eclipse.yasson.internal.Marshaller.marshall(Marshaller.java:73)
	at org.eclipse.yasson.internal.Marshaller.marshall(Marshaller.java:101)
	at org.eclipse.yasson.internal.JsonBinding.toJson(JsonBinding.java:126)
	at test.MapObjectTest.test1(MapObjectTest.java:95)
	...
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Locale
	at test.MapObjectTest$LocaleSerializer.serialize(MapObjectTest.java:27)
	at org.eclipse.yasson.internal.serializer.UserSerializerSerializer.serialize(UserSerializerSerializer.java:53)
	at org.eclipse.yasson.internal.serializer.AbstractContainerSerializer.serializerCaptor(AbstractContainerSerializer.java:125)
	at org.eclipse.yasson.internal.serializer.AbstractContainerSerializer.serializeItem(AbstractContainerSerializer.java:194)
	at org.eclipse.yasson.internal.serializer.MapToEntriesArraySerializer.lambda$serializeContainer(MapToEntriesArraySerializer.java:111)
	at java.util.HashMap.forEach(HashMap.java:1289)
	at org.eclipse.yasson.internal.serializer.MapToEntriesArraySerializer.serializeContainer(MapToEntriesArraySerializer.java:106)
	at org.eclipse.yasson.internal.serializer.MapSerializer.serializeInternal(MapSerializer.java:156)
	at org.eclipse.yasson.internal.serializer.MapSerializer.serializeInternal(MapSerializer.java:27)
	at org.eclipse.yasson.internal.serializer.AbstractContainerSerializer.serialize(AbstractContainerSerializer.java:107)
	at org.eclipse.yasson.internal.serializer.AbstractContainerSerializer.serializerCaptor(AbstractContainerSerializer.java:125)
	at org.eclipse.yasson.internal.serializer.ObjectSerializer.marshallProperty(ObjectSerializer.java:121)
	at org.eclipse.yasson.internal.serializer.ObjectSerializer.serializeInternal(ObjectSerializer.java:69)
	... 38 more

        1. issue-map-locale-key.zip
          3 kB

              rhn-support-rmartinc Ricardo Martin Camarero
              rhn-support-rmartinc Ricardo Martin Camarero
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                Created:
                Updated:
                Resolved: