JerseyでJSONオブジェクトをPOSTする件

AccessTokenRequestParam.java

@Data
@AllArgsConstructor
public class AccessTokenRequestParam {

    private String redirect_url;

    private String client_id;

    private String client_secret;

    private String grant_type;

    private String code;

}

pom.xml

		<dependency>
			<groupId>org.glassfish.jersey.core</groupId>
			<artifactId>jersey-client</artifactId>
			<version>${jersey.version}</version>
		</dependency>
		<!-- jersyでProxyを使う場合。 -->
		<dependency>
			<groupId>org.glassfish.jersey.connectors</groupId>
			<artifactId>jersey-apache-connector</artifactId>
			<version>${jersey.version}</version>
		</dependency>
		<!-- jersyでJavaBeansをJSON でPOSTする場合。 -->
		<dependency>
			<groupId>org.glassfish.jersey.media</groupId>
			<artifactId>jersey-media-json-jackson</artifactId>
			<version>${jersey.version}</version>
		</dependency>

Utils.java

    public static String getAccessToken(String oauth_server,
            String redirect_url, String client_id, String client_secret,
            String authorizationCode, Client client) throws ServletException {
        String result = null;
        try {
            log.debug("OAuthServer:{}", oauth_server);
            String grant_type = "authorization_code";
            AccessTokenRequestParam entity = new AccessTokenRequestParam(
                    redirect_url, client_id, client_secret, grant_type,
                    authorizationCode);
            Response restResponse = client //
                    .target(oauth_server) //
                    .request(MediaType.APPLICATION_JSON_TYPE)
                    // .post(Entity.entity(formParams,
                    // MediaType.APPLICATION_FORM_URLENCODED_TYPE));
                    .post(Entity.entity(entity,
                            MediaType.APPLICATION_JSON_TYPE));
            result = restResponse.readEntity(String.class);
            log.debug(result);
        } catch (BadRequestException e) {
            throw new ServletException(e);
        }
        return result;
    }

Utils2.java

    public static String getAccessTokenJSON(String oauth_server,
            String redirect_url, String client_id, String client_secret,
            String authorizationCode, Client client) throws ServletException {
        String grant_type = "authorization_code";

        String result = null;
        // MultivaluedMap<String, String> formParams = new
        // MultivaluedHashMap<String, String>();
        // formParams.putSingle("client_secret", client_secret);
        // formParams.putSingle("client_id", client_id);
        // formParams.putSingle("grant_type", grant_type);
        // formParams.putSingle("redirect_uri", redirect_url);
        // formParams.putSingle("code", authorizationCode);

        Map<String, String> formParams = new HashMap<String, String>();
        formParams.put("client_secret", client_secret);
        formParams.put("client_id", client_id);
        formParams.put("grant_type", grant_type);
        formParams.put("redirect_uri", redirect_url);
        formParams.put("code", authorizationCode);
        try {
            log.debug("OAuthServer:{}", oauth_server);
            Response restResponse = client //
                    .target(oauth_server) //
                    .request(MediaType.APPLICATION_JSON_TYPE)
                    // .post(Entity.entity(formParams,
                    // MediaType.APPLICATION_FORM_URLENCODED_TYPE));
                    .post(Entity.entity(formParams,
                            MediaType.APPLICATION_JSON_TYPE));

            result = restResponse.readEntity(String.class);
            log.debug(result);
            checkAccessTokenResult(restResponse);

        } catch (BadRequestException e) {
            throw new ServletException(e);
        }
        return result;
    }