jackson2

I am using jackson 2 to parse an object to json format I am having problem when I parse lazy loading fields. I want to get a null reference if the object cannot be loaded. How can I do that? I want to discuss with you a solution and I want to know if there is a problem when I use it? I have found that during parsing jackson uses getters method to get attributes So my solution is to modify the getters methods of lazy loading fields suppose that post is a lazy loaded field this is the getter of that fields public Collection<Post> getPosts() { try{ posts.size(); return posts; } catch (Exception e

I have JsonNode result that I want to print out. So far, I am using: ObjectMapper mapper = new ObjectMapper(); mapper.enable(SerializationFeature.INDENT_OUTPUT); File outputFile = new File( getCurOutputDir(), String.format("out.json", getClass().getSimpleName()) ); mapper.writeValue(new FileOutputStream(outputFile), resultNode); which outputs something like: { "A" : [ { "Ai" : { "Ai1" : 42, "Ai2" : 55 } } ], "B" : [ 86 ] } but I need it to be in this specific format: { "A" : [ { "Ai" : { "Ai1" : 42, "Ai2" : 55 } } ], "B" : [ 86 ] } For context, I am transitioning from JSONObject to Jackson, so

I have some questions related to JSON serialization using Jackson in a project where I use Spring Boot 2.0.0.M6 , Spring Framework 5.0.1.RELEASE and Jackson 2.9.2 . I have configured the following Jackson-related settings in application.properties : spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS=false Serialization works mostly as I need. Nevertheless, I have noticed that Jackson seems to cut-off milliseconds if they are 000 . Test 1: Serialize Instant with milliseconds set to 000 : Initialize Instant field using Instant.parse("2017-09-14T04:28:48.000Z") Serialize it using Jackson

This question already has an answer here: Can't set ProblemHandler to ObjectMapper in Spring Boot 1 answer As I understood, Spring is already providing a bean for Jackson ObjectMapper . Therefore, instead of creating a new bean, I'm trying to customize this bean. From this blog post , and then this Github project I used Jackson2ObjectMapperBuilder bean to achieve this customization. @Bean public Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder(ApplicationContext context) { Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder(); builder.findModulesViaServiceLoader(true);

i am trying to map certain json fields to a class instance variable. My sample Person class looks like: public class Person { private String name; private Address address; //many more fields //getters and setters } The sample Address class is: public class Address { private String street; private String city; //many more fields // getters and setters } The json object to be deserialized to my Person class doesn't contain "address" field. It looks like: { "name":"Alexander", "street":"abc 12", "city":"London" } Is there a way to deserialize the json to the Person pojo where the Address fields

I have a REST API which returns a JSON response as: { "channel" : "JHBHS" } and sometimes it returns: { "channel": { "id": 12321, "name": "Some channel" } } I have a POJO like: public class Event { private String channel; @JsonProperty("channel") private Channel channelObj; } public class Channel { private int id; private String name; } So, is there a way (other than writing your own custom deserializer ) in Jackson2 which will help me map channel in JSON to String type when it's a String and Channel type when it's a JSON Object? Or in other words, is there a way in Jackson which maps by type