Error Converting Java Object to JSON Object

Question

Using jackson API, I am trying to convert java object to json string. I have gone through several posts but not able to through the below stack-trace.

com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class java.io.FileDescriptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.imc.idm.data.request.DirectoryDetailData["logoImage"]->org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile["inputStream"]->java.io.FileInputStream["fd"])
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
    at com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
    at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)

My code is similar to this one below:

public class Infomation {
    private MultipartFile img;
    private Manufacture manufacture;
    private List<Long> otherVal1;
    private List<MyCustomClass> otherVal2;
}

Component :

ObjectMapper objectMapper = new ObjectMapper();
final String jsonString = objectMapper.writeValueAsString(infomationObject);
final MyDTO myDto = MyDTO.newBuilder().withValue(jsonString).build();
dataRepository.save(myDto);

make sure your classes are serializable, i mean they implements Serializable interface. — DevJava
– DevJava, Commented Nov 29, 2017 at 14:49
Do I need to serialize Infomation class only, because MultipartFile is the class present in apis. — Vivek Dhiman
– Vivek Dhiman, Commented Nov 29, 2017 at 14:52
What is objectMapper and what is infomationObject. Please provide more information — nhoxbypass
– nhoxbypass, Commented Nov 29, 2017 at 15:01
infomationObject is the object of Information class, which I am getting when do Post call. — Vivek Dhiman
– Vivek Dhiman, Commented Nov 29, 2017 at 15:16

diginoise · Accepted Answer · 2017-11-30 10:02:44Z

1

Serializable interface/marker is not implemented in MultipartFile.

If you have Spring Web in your dependencies, you can use CommonsMultipartFile as it implements Serializable and MultipartFile.

For more information, please see Commons Multipart File Java API

edited Nov 30, 2017 at 10:02

diginoise

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answered Nov 29, 2017 at 15:18

ksv

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