How to use

setDefaultMergeable

method

in

com.fasterxml.jackson.databind.cfg.ConfigOverrides

/**
 * Method for setting default Setter configuration, regarding things like
 * merging, null-handling; used for properties for which there are
 * no per-type or per-property overrides (via annotations or config overrides).
 *
 * @since 2.9
 */
public ObjectMapper setDefaultMergeable(Boolean b) {
  _configOverrides.setDefaultMergeable(b);
  return this;
}

/**
 * Method for setting default Setter configuration, regarding things like
 * merging, null-handling; used for properties for which there are
 * no per-type or per-property overrides (via annotations or config overrides).
 *
 * @since 2.9
 */
public ObjectMapper setDefaultMergeable(Boolean b) {
  _configOverrides.setDefaultMergeable(b);
  return this;
}