jackson-databind

问题 I have the following two types of JSON objects: {"foo": "String value"} and {"bar": "String value"} Both of them represent a specialized type of the same base object. How can I use Jackson for deserializing them ? The type information is only represented by the keys themselves and not the value for any key (almost all examples use the value of the key for determining the type : https://github.com/FasterXML/jackson-docs/wiki/JacksonPolymorphicDeserialization) 回答1: Jackson doesn't offer an out

问题 I have an endpoint like this: @POST public Response update(MyDocument myDocument){} If the request is not valid, my server would get some quite long logs like this: javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: com.fasterxml.jackson.core.JsonParseException: Unexpected character.... ... Caused by... ... Caused by... The exception is hard to be avoided completely, so I am wondering how could I catch the JsonParseException? 回答1: Implement an ExceptionMapper for

问题 I have the following three applications: Project 1 holds Business logic (Spring Cloud Function) An interface IDemoEntity Project 2 AWS-specific handler One implementation of IDemoEntity , with DynamoDB-specific annotations The project is based on Spring Boot Project 3 One implementation of IDemoEntity , with CosmosDB annotation Azure-specific handler The classes of project 1 look like this: public interface IDemoEntity { String getName(); void setName(String name); } @Component public class

问题 This is my JSON Array :- [ { "firstName" : "abc", "lastName" : "xyz" }, { "firstName" : "pqr", "lastName" : "str" } ] I have this in my String object. Now I want to convert it into Java object and store it in List of java object. e.g. In Student object. I am using below code to convert it into List of Java object : - ObjectMapper mapper = new ObjectMapper(); StudentList studentList = mapper.readValue(jsonString, StudentList.class); My List class is:- public class StudentList { private List

问题 I use Jackson 2.9.8 for converting my below POJO as JSON : public class ResponseEntity implements Serializable { private static final long serialVersionUID = 1L; private int total_record_count; private int filtered_record_count; @JsonProperty("list") private List<Map<String,Object>> entityList; public ResponseEntity(List<Map<String,Object>> entityList) { this.entityList = entityList; this.filtered_record_count = entityList.size(); } public int getTotal_record_count() { return total_record

问题 I have problems to deserialize some nested Json. The json : JSON LINK HERE To deserialize : And the two classes : I'm getting this Exception : com.fasterxml.jackson.databind.JsonMappingException: Unrecognized Type: [null] Any suggestions? 回答1: suppose you have missed two properties in your RandomBixi Class . class RandomBixi { @JsonProperty("id") int id; @JsonProperty("s") String nom; @JsonProperty("n") int idTerminal; @JsonProperty("st") int etatStation; @JsonProperty("b") boolean bloque;

问题 I'm receiving, for instance, this JSON from an external vendor (where payload can be variable): { "payload": { "enrolledAt": "2018-11-05T00:00:00-05:00", "userId": "99c7ff5c-2c4e-423f-abeb-2e5f3709a42a" }, "requestId": "80517bb8-2a95-4f15-9a73-fcf3752a1147", "eventType": "event.success", "createdAt": "2018-11-05T16:55:13.762-05:00" } I'm trying to model these using this class: public final class Notification<T extends AbstractModel> { @JsonProperty("requestId") private String requestId;

问题 I'm using jackson (with spring boot) to return some DTOs like json. The problem is that I have specific DTO which contains nested objects, which contains another objects. Can I have ignore some nested properties directly from the DTO, without any Annottations on the nested objects (because they are used in another DTOs) public class MyDTO { private MyObjectA a; } public class MyObjectA a { private MyNestedObject b; } I want when i serialize MyDTO to exclude MyNestedObject b I've tried with

问题 I use Java 9, Jackson-core and jackson-databind 2.5.5 I would like to use custom serialization with the DefaultTyping.NON_FINAL option for writing class names in Json. if I delete the default typing NON_FINAL, everything works. When I add the NON_FINAL option, my custom serializer "MySerializer" is called and I have the exception JsonMappingException: Type id handling not implemented public class Main { public static void main(String[] args) throws JsonProcessingException { ObjectMapper

问题 I have below XML which I am getting from third party(rest service) <response> <error>Document Too Small</error> <error>Barcode Not Detected</error> <error>Face Image Not Detected</error> </response> I am calling third party service with below code which is trying to convert the xml to respective java object - restTemplate.postForObject("/test", new HttpEntity<>(request, headers), Eror.class); We have added the MappingJackson2XmlHttpMessageConverter- MappingJackson2XmlHttpMessageConverter