Exception while Converting String to Json - no String-argument constructor/factory method to deserialize from String value

Question

Hi i am trying to make an API call from another legacy application. I cannot add any more dependency in legacy application. The legacy application is trying to make a call to API with request Body as argumentsMap.toString() , here argumentsMap is a HashMap which contains lot of parameters . I cannot add any more dependency in legacy app like ObjectMapper. Currently i am trying to receive it as below.

public byte[] report(@RequestBody String argumentsMapParams) {
  ObjectMapper objectMapper = new ObjectMapper();
  String jsonFormat = objectMapper.writeValueAsString(stringReportArguments);
  ReportArguments reportArguments = objectMapper.readValue(jsonFormat,ReportArguments.class);
}

My aim is to convert the string i am receiving into ReportArguments class. Above code giving me an error like

no String-argument constructor/factory method to deserialize from String value

How i can do it .

The parameter i am receiving will be like , plain text

 {fromDate=12, rptSql=select * from property}

This is my ReportArguments Class

 @Data
 @NoArgsConstructor
 @AllArgsConstructor
 @ToString
 @JsonIgnoreProperties
 public class ReportArguments implements Serializable {

 @JsonProperty("fromDate")
 String fromDate;
 @JsonProperty("rptSql")
 String rptSql;

Have you tried simply using byte[] report(@RequestBody ReportArguments reportArguments) directly? — sp00m
– sp00m, Commented Sep 21, 2022 at 14:59
Wait, you're receiving strictly this: {fromDate=12, rptSql=select * from property}? This isn't valid JSON, not is it any known format (to me at least), so I'm afraid you'll have to parse it manually. This data "JSONised" would be {"fromDate": 12, "rptSql": "select * from property"}, which Spring via Jackson/GSON/AnyJsonParser would be able to parse. — sp00m
– sp00m, Commented Sep 21, 2022 at 15:02
Correct , This is coming as a plain text . i believe that is the problem here . How i can convert it to json string — VKP
– VKP, Commented Sep 21, 2022 at 15:03

Sisir Ashik · Accepted Answer · 2022-09-21 14:39:11Z

0

Have you included getter/setter method for ReportArguments. Object mapper will serialize/deserialize based on getter/setter method.

answered Sep 21, 2022 at 14:39

Sisir Ashik

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1 Comment

VKP Over a year ago

I think the problem is with the plain string to json string conversion. I updated the question with my class as well . The class have getters and setters

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