It should be so simple, but I just cannot find it after being trying for an hour. I need to get a JSON string, for example, {“k1″:v1,”k2”:v2}, parsed as a JsonNode. JsonFactory factory = new JsonFactory(); JsonParser jp = factory.createJsonParser(“{\”k1\”:\”v1\”}”); JsonNode actualObj = jp.readValueAsTree(); gives java.lang.IllegalStateException: No ObjectCodec defined for the parser, can not deserialize … Read more
I’ve been looking at Jackson, but is seems I would have to convert the Map to JSON, and then the resulting JSON to the POJO. Is there a way to convert a Map directly to a POJO? 9 Answers 9
I’m using JAVA 1.6 and Jackson 1.9.9 I’ve got an enum public enum Event { FORGOT_PASSWORD(“forgot password”); private final String value; private Event(final String description) { this.value = description; } @JsonValue final String value() { return this.value; } } I’ve added a @JsonValue, this seems to do the job it serializes the object into: {“event”:”forgot … Read more
I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson(). Below is an example of what the string can look like: { ‘title’: ‘ComputingandInformationsystems’, ‘id’: 1, ‘children’: ‘true’, ‘groups’: [{ ‘title’: ‘LeveloneCIS’, ‘id’: 2, ‘children’: ‘true’, ‘groups’: [{ … Read more
How do I use Jackson JSON mapper with Java 8 LocalDateTime? org.codehaus.jackson.map.JsonMappingException: Can not instantiate value of type [simple type, class java.time.LocalDateTime] from JSON String; no single-String constructor/factory method (through reference chain: MyDTO[“field1”]->SubDTO[“date”]) 23 Answers 23
I get the an exception when trying to serialize a very simple object using Jackson. The error: org.codehaus.jackson.map.JsonMappingException: No serializer found for class MyPackage.TestA and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) Below is the simple class and code to serialize. Can anyone tell my why I get this error? … Read more
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 years ago. Improve this question After searching through some existing libraries for JSON, I have finally ended up with these … Read more
I have a user object that is sent to and from the server. When I send out the user object, I don’t want to send the hashed password to the client. So, I added @JsonIgnore on the password property, but this also blocks it from being deserialized into the password that makes it hard to … Read more
The Jackson library’s ObjectMapper class seems to be thread safe. Does this mean that I should declare my ObjectMapper as a static field like this class Me { private static final ObjectMapper mapper = new ObjectMapper(); } instead of as an instance-level field like this? class Me { private final ObjectMapper mapper = new ObjectMapper(); … Read more
I am getting the following error when trying to get a JSON request and process it: org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.myweb.ApplesDO]: can not instantiate from JSON object (need to add/enable type information?) Here is the JSON I am trying to send: { “applesDO” : [ { “apple” : “Green … Read more
