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The official DocuSign eSignature JAVA client is based on version 2 of the DocuSign REST API and provides libraries for JAVA application integration. It is recommended that you use this version of the library for new development.

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package com.docusign.esign.client;

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import jakarta.ws.rs.ext.ContextResolver;
import java.text.DateFormat;

/** JSON Class. */
public class JSON implements ContextResolver {
  private ObjectMapper mapper;

  /** JSON Class constructor doc. */
  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());
  }

  /**
   * Returns the current object mapper used for JSON serialization/deserialization.
   *
   * Note: If you make changes to the object mapper, remember to set it back via 
   * setObjectMapper in order to trigger HTTP client rebuilding.
   *
   * @return Object mapper
   */
  public ObjectMapper getObjectMapper() {
    return mapper;
  }

  public JSON setObjectMapper(ObjectMapper mapper) {
    this.mapper = mapper;
    return this;
  }

  /**
   * Set the date format for JSON (de)serialization with Date properties.
   *
   * @param dateFormat Date format
   */
  public void setDateFormat(DateFormat dateFormat) {
    mapper.setDateFormat(dateFormat);
  }

  @Override
  public ObjectMapper getContext(Class type) {
    return mapper;
  }
}