[java-client][jersey2] ignore getter when serializing

[jmini]

Given this spec:

openapi: 3.0.1
info:
  title: ping test
  version: '1.0'
servers:
  - url: 'http://localhost:9999/'
paths:
  /ping:
    post:
      operationId: postPing
      requestBody:
        content:
          'application/json':
             schema:
               $ref: "#/components/schemas/SomeObj"
      responses:
        '201':
          description: OK
          content:
            'application/json':
               schema:
                 $ref: "#/components/schemas/SomeObj"
components:
  schemas:
    SomeObj:
      type: object
      properties:
        $_type:
          type: string
        id:
          type: integer
          format: int64
        name:
          type: string

It generates:

public class SomeObj {
  @JsonProperty("$_type")
  private String $type;

  //...

  public SomeObj $type(String $type) {
    this.$type = $type;
    return this;
  }

   /**
   * Get $type
   * @return $type
  **/
  @javax.annotation.Nullable
  @ApiModelProperty(value = "")
  public String get$Type() {
    return $type;
  }

  public void set$Type(String $type) {
    this.$type = $type;
  }

  //...
}

Because the getter get$Type() looks a little bit different than the $type field annotated with @JsonProperty("$_type"), jackson serializes the object like this:

{ "$_type": "someValue", "$Type": "someValue", "id": 42, "name": "test"}

Because all fields are generated with a proper @JsonProperty, discovery of the getters should be disabled when doing the serialization.

This can be configured in the generated JSON class:

openapi-generator/samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/JSON.java

Lines 16 to 30 in 411199b

	public JSON() {
	mapper = new ObjectMapper();
	mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
	mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
	mapper.configure(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE, false);
	mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
	mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
	mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
	mapper.setDateFormat(new RFC3339DateFormat());
	ThreeTenModule module = new ThreeTenModule();
	module.addDeserializer(Instant.class, CustomInstantDeserializer.INSTANT);
	module.addDeserializer(OffsetDateTime.class, CustomInstantDeserializer.OFFSET_DATE_TIME);
	module.addDeserializer(ZonedDateTime.class, CustomInstantDeserializer.ZONED_DATE_TIME);
	mapper.registerModule(module);
	}

By adding a disable command for:

• MapperFeature.AUTO_DETECT_CREATORS
• MapperFeature.AUTO_DETECT_FIELDS
• MapperFeature.AUTO_DETECT_GETTERS
• MapperFeature.AUTO_DETECT_IS_GETTERS

More info: https://stackoverflow.com/questions/25893985/jackson-how-to-serialize-only-annotated-properties

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[jmini]

Instead of configuring the mapper, an other approach is to use the@JsonAutoDetect annotation with visibility NONE.