code: public List<ContactsResponse> getCharactersCharacterIdContacts(Integer characterId, String datasource,
              String ifNoneMatch, Integer page, String token) throws ApiException {
          ApiResponse<List<ContactsResponse>> resp = getCharactersCharacterIdContactsWithHttpInfo(characterId,
                  datasource, ifNoneMatch, page, token);
          return resp.getData();
      }
docs: Get contacts Return contacts of a character --- This route is cached for
  up to 300 seconds SSO Scope: esi-characters.read_contacts.v1
  
  @param characterId
  An EVE character ID (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param ifNoneMatch
  ETag from a previous request. A 304 will be returned if this
  matches the current ETag (optional)
  @param page
  Which page of results to return (optional, default to 1)
  @param token
  Access token to use if unable to set a header (optional)
  @return List&lt;ContactsResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body