小编Viv*_*iri的帖子

我正在尝试与 Paytm 进行钱包集成。要生成 Oauth 令牌，我们需要通过使用客户端密钥加密来提供客户端 ID。我正在努力找出如何或从哪里从 Paytm 获取客户端 ID 和密钥。Paytm 的 API 文档说

Oauth API

先决条件： 客户 ID ：将由 paytm 提供以进行身份​​验证 客户机密 ：将由 paytm 提供以进行身份​​验证

http://paywithpaytm.com/developer/paytm_api_doc?target=oauth-apis

org.springframework.http.converter.HttpMessageNotWritableException：无法写入JSON：（是java.lang.NullPointerException）（通过引用链：in.xyz.sync.dto.ClassRoom [“id”]）；嵌套异常是 com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (通过引用链: in.xyz.sync.dto.ClassRoom["id"])

import java.util.List;

import org.codehaus.jackson.annotate.JsonIgnoreProperties;
import org.codehaus.jackson.map.annotate.JsonSerialize;

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class ClassRoom extends CommonResponse {

    private long classId;
    private String clientClassRoomId;
    private long instituteId;
    private long teacherId;
    private String className;
    private long handleId;
    private int archived;
    private int deleted;
    private String creationTime;
    private String modifiedTime;
    private int type;
    private String classCode;
    private List<Student> student;
    private String handle;
    private String firstName;


}