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How do I create a ObjectNode from a string using Jackson?
I tried:
ObjectNode json = new ObjectMapper().readValue("{}", ObjectNode.class);
But get
Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "type": jdk.nashorn.internal.ir.Symbol#setType(1 params) vs jdk.nashorn.internal.ir.Symbol#setType(1 params)
I want to be able to read a JSON string the add/modify some values.
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The process of parsing JsonString into JsonNode is very simple. We simply create an instance of ObjectMapper class and use its readTree() method in the following way: String str = "{\"proId\":\"001\",\"proName\":\"MX Pro 20\",\"price\":\"25k\"}"; ObjectMapper map = new ObjectMapper();
Create an empty JSON Array To create a JSON Object we used createObjectNode() method of ObjectMapper class. Similarly to create JSON Array we use createArrayNode() method of ObjectMapper class. createArrayNode() will return reference of ArrayNode class.
Stringify a JavaScript ObjectUse the JavaScript function JSON.stringify() to convert it into a string. const myJSON = JSON.stringify(obj); The result will be a string following the JSON notation.
Read Object From JSON via URL ObjectMapper objectMapper = new ObjectMapper(); URL url = new URL("file:data/car. json"); Car car = objectMapper. readValue(url, Car. class);
You are using the wrong import.
It should be
com.fasterxml.jackson.databind.node.ObjectNode
Not:
jdk.nashorn.internal.ir.ObjectNode
Firstly, the error message suggests you're tying to build a jdk.nashorn.internal.ir.ObjectNode, whereas I'm guessing you actually intended to build a com.fasterxml.jackson.databind.node.ObjectNode (for Jackson 2.x). Check your imports.
However, if all you want to do is build an empty ObjectNode, then just use
JsonNodeFactory.instance.objectNode()
If for some reason you really want to do it by parsing an empty JSON object, then use this:
ObjectNode json = (ObjectNode) new ObjectMapper().readTree("{}");
But that's just unpleasant.
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