Seeing the exception when I call the GET method in RestTemplate com.fasterxml.jackson.databind.JsonMappingException: N/A at [Source: (StringReader); line: 1, column: 13700] (through reference chain: com.homedepot.merch.meter.model.ResultSet[“issues”]->java.util.ArrayList[0]->com.homedepot.merch.meter.model.Issue[“fields”]) the sample java code is java classses are and the Issue class definition is How do I fix this JsonMappingException? Answer You are trying to serialize the result of a method that returns void. Also, I
Tag: jackson-databind
How to write common pojo deserializer for json attribute which can be an object and an array both?
Background: I am getting mismatchedInputException, when parsing json. com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type java.util.ArrayList<Data> from Object value (token JsonToken.START_OBJECT) Problem: nodes is a json-array which contains data, which can be either json-object or json-array . I need to represent this correctly in POJO. Things Tried: Map<String, Object>, List, ,@JsonDeserialize(using = NodeDeserializer.class) Below is my nested json document for ref.
How to get Jackson To Throw An Error on Incorrect Casing On Deserialization
I have the following class: and my mapper looks as follows: Today, if someone messes up their json object for example messing up the capitalization on client: it will deserialize client to null. I’d like it to error because the casing is wrong. (And for any key that’s passed in with bad casing). Is there a way to do this
How to deserialize JSON with @JsonCreator and @JsonGetter
I have the JSON looks like the following: and I have a class Person: I need to deserialize and serialize it, but when I’m trying to deserialize this JSON I get unexpected result. Why when I’m trying to deserialize it the @JsonGetter annotation is used for it? How can I disable @JsonGetter annotation when I try to deserialize the JSON?
Setter in DTO just for integration testing?
I couldn’t find the info I’m looking for hence posting here for suggestion and getting to know better approach. I have an immutable DTO object like: Now I’m working on an integration test with testcontainer where I want the accountOpeningDate and installmentPaidDate to be dynamic value hence in order to set these values from Integration Tests, is it a good
Global jackson ObjectMapper not registering custom serializer
I am using Java 17, spring-boot 2.6.3 with spring-webflux and spring-consul dependencies and I have the following class: Here’s my custom serializer. And my models are as simples as this: I can’t annotate my model class with @JsonSerialize(using = ModelSerializer.class) because it is in a dependency that I am not allowed to modify. I know I did wrote the code
How to read value from JSON with Jackson Java
I have a JSON file: I want to get the items separately. I try to do, but the result did null: This is class for Items: What I do wrong? how correctly read value from items? Answer You didn’t handle the JSON array – items – properly, so as I commented under OP, all what you need to do is
gradle runtime dependency makes test fail because of jackson dependencies issue
On a JEE project running on Wildfly 15, I am trying to configure the logs to be in json format. Replicating what I have done dozens of times for some more recent Spring Boot projects, I am adding net.logstash.logback:logstash-logback-encoder:6.6 as a runtimeOnly dependency, as I plan to have a logback.xml config file. When building my application and running the test,
How do I set the coder for a PCollection<List> in Apache Beam?
I’m teaching myself Apache Beam, specifically for using in parsing JSON. I was able to create a simple example that parsed JSON to a POJO and POJO to CSV. It required that I use .setCoder() for my simple POJO class. The problem Now I am trying to skip the POJO step of parsing using some custom transforms. My pipeline looks
Different @JsonProperty config for READ and WRITE on same field?
I have a class (which cannot be modified) like When deserializing I get data like: As I cannot modify the Standing class I have a mix-in like: As the received json does not have positionNumber and positionText fields I use the @JsonPropery annotations. With Access.READ_ONLY I simply ignore the positionNumber field. And with @JsonProperty(value = “position”, access = JsonProperty.Access.WRITE_ONLY) on