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The Jackson JsonNode has a special method called at() . The at() method can access a JSON field from anywhere in the JSON graph which the given JsonNode is the root of.

Tabnine

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com.fasterxml.jackson.databind.JsonNode.at java code examples | Tabnine

JsonNode ensureExistence(JsonNode node) { final JsonNode found = node.at(path); if (found.isMissingNode()) { throw new JsonPatchException("non-existent path: " + path); } return found; } origin: com.reprezen.jsonoverlay/jsonoverlay · private <X> JsonOverlay<X> _addChild(String name, String path, OverlayFactory<X> factory) { JsonPointer pointer = JsonPointer.compile(path.isEmpty() ?

GitHub

github.com › codehaus › jackson › blob › master › src › java › org › codehaus › jackson › JsonNode.java

jackson/src/java/org/codehaus/jackson/JsonNode.java at master · codehaus/jackson

public JsonNode get(int index) { return null; } · /** * Method for accessing value of the specified field of · * an object node. If this node is not an object (or it · * does not have a value for specified field name), or · * if there is no field with such name, null is returned.

Author codehaus

Red Hat

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JsonNode (Red Hat JBoss Enterprise Application Platform 7.1.0.Beta1 public API)

public abstract class JsonNode extends JsonSerializable.Base implements TreeNode, Iterable<JsonNode>

Fasterxml

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JsonNode (jackson-databind 2.7.0 API)

public abstract class JsonNode extends JsonSerializable.Base implements TreeNode, Iterable<JsonNode>

Adobe Developer

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JsonNode (The Adobe Experience Manager SDK 2022.11.9850.20221116T162329Z-220900)

public final JsonNode at(JsonPointer ptr) Method for locating node specified by given JSON pointer instances. Method will never return null; if no matching node exists, will return a node for which isMissingNode() returns true. Specified by: at in interface TreeNode ·

Baeldung

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Working with Tree Model Nodes in Jackson | Baeldung

January 8, 2024 - Learn how to create, find and manipulate JsonNode objects in Jackson 2.

Fasterxml

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JsonNode (jackson-databind 2.8.0 API)

public abstract class JsonNode extends JsonSerializable.Base implements TreeNode, Iterable<JsonNode>

Stack Overflow

stackoverflow.com › questions › 76487938 › is-there-a-way-to-put-a-value-to-jackson-jsonnode-like-you-get-it-with-jsonnode

java - Is there a way to put a value to Jackson JsonNode like you get it with jsonNode.at("/deep/path/to/var")? - Stack Overflow

Top answer

1 of 1

1

Ah ok now I understand how to do it with

jsonNode.at("/deep/path");

This function returns a JsonNode and you could manipulate it when you cast it to an ObjectNode. If you do that the whole tree get this update.

So my code looks like:

JsonNode jsonNode = new ObjectMapper().valueToTree(myMap);
JsonNode nodeToSetValue = jsonNode.at("/deep/path");
String oldValue = ((ObjectNode) nodeToSetValue).get("finalKey").asText();
String newValue = changeValue(oldValue);
((ObjectNode) nodeToSetValue).put("finalKey", newValue);
myMap = new ObjectMapper().convertValue(jsonNode, new TypeReference<Map<String, Object>>(){}));

Javadoc.io

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JsonNode (jackson-databind 3.0.0 API)

protected abstract JsonNode · _at · (JsonPointer ptr) Helper method used by other methods for traversing the next step of given path expression, and returning matching value node if any: if no match, null is returned. protected <T> T · _reportRequiredViolation ·

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Red Hat

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Uses of Class com.fasterxml.jackson.databind.JsonNode (Red Hat JBoss Enterprise Application Platform 7.2.0.CD12 public API)

Microsoft Learn

learn.microsoft.com › en-us › dotnet › api › system.text.json.nodes.jsonnode

JsonNode Class (System.Text.Json.Nodes) | Microsoft Learn

June 21, 2023 - The base class that represents a single node within a mutable JSON document.

Fasterxml

fasterxml.github.io › jackson-databind › javadoc › 2.4 › com › fasterxml › jackson › databind › JsonNode.html

JsonNode (jackson-databind 2.4.0 API)

public final JsonNode at(JsonPointer ptr) Method for locating node specified by given JSON pointer instances. Method will never return null; if no matching node exists, will return a node for which isMissingNode() returns true. Specified by: at in interface TreeNode ·

Adobe Developer

developer.adobe.com › experience-manager › reference-materials › 6-4 › javadoc › com › fasterxml › jackson › databind › JsonNode.html

JsonNode ("The Adobe AEM Quickstart and Web Application.")

public final JsonNode at(JsonPointer ptr) Method for locating node specified by given JSON pointer instances. Method will never return null; if no matching node exists, will return a node for which isMissingNode() returns true. Specified by: at in interface TreeNode ·

Red Hat

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JsonNode (Red Hat JBoss Enterprise Application Platform 7.4.0.CD19 public API)

IllegalArgumentException - if no value node exists at given JSON Pointer path · Since: 2.10 · public final JsonNode requiredAt(JsonPointer path) throws IllegalArgumentException ·

Java Tips

javatips.net › api › com.fasterxml.jackson.databind.jsonnode

Java Examples for com.fasterxml.jackson.databind.JsonNode

@Test public void testCollectionQueryDuplicateThrowsAssertionException() throws IOException { QuerySerializer serializer = new QuerySerializer(); serializer.setQuery("[base=Haus]", "poliqarp"); serializer.setCollection("textClass=politik & corpusID=WPD"); ObjectMapper m = new ObjectMapper(); JsonNode first = m.readTree(serializer.toJSON()); assertNotNull(first); assertEquals(first.at("/collection"), m.readTree(serializer.toJSON()).at("/collection")); assertEquals(first.at("/collection"), m.readTree(serializer.toJSON()).at("/collection")); assertEquals(first.at("/collection"), m.readTree(serializer.toJSON()).at("/collection")); }

Stack Overflow

stackoverflow.com › questions › 51923591 › how-to-retrieve-a-value-from-an-array-inside-of-a-json-object-using-jackson

java - How to retrieve a value from an array inside of a JSON object using Jackson - Stack Overflow

Top answer

1 of 3

9

The correct json path expression would be "/aaa/0/value1"

Use:

jsonNode.at("/aaa/0/value1")

2 of 3

1

use this below code :

    JsonNode node = mapper.readTree(json);
    System.out.println(node.path("aaa").get(0)); // {"value1":"123"}

use jackson-databind.
use this

node.path("aaa").get(0).get("value1") // 123.

TutorialsPoint

tutorialspoint.com › jackson › jackson_tree_model.htm

Jackson - Tree Model

package com.tutorialspoint; import java.io.IOException; import java.util.Iterator; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; public class JacksonTester { public static void main(String args[]){ try { ObjectMapper mapper = new ObjectMapper(); String jsonString = "{\"name\":\"Mahesh Kumar\", \"age\":21,\"verified\":false,\"marks\": [100,90,85]}"; JsonNode rootNode = mapper.readTree(jsonString); JsonNode nameNode = rootNode.path("name"); System.out.println("Name: "+ nameNode.textValue()); JsonNode ageNode = rootNode.path("age"); System.out.println("Age: " + ageNode.intValue()); JsonNode verifiedNode = rootNode.path("verified"); System.out.println("Verified: " + (verifiedNode.booleanValue() ?

Fasterxml

fasterxml.github.io › jackson-databind › javadoc › 2.12 › com › fasterxml › jackson › databind › JsonNode.html

JsonNode (jackson-databind 2.12.0 API)

IllegalArgumentException - if no value node exists at given JSON Pointer path · Since: 2.10 · public final JsonNode requiredAt(JsonPointer path) throws IllegalArgumentException ·

Javadoc.io

javadoc.io › doc › com.fasterxml.jackson.core › jackson-databind › 2.10.0 › com › fasterxml › jackson › databind › JsonNode.html

JsonNode - jackson-databind 2.10.0 javadoc

Bookmarks · Latest version of com.fasterxml.jackson.core:jackson-databind · https://javadoc.io/doc/com.fasterxml.jackson.core/jackson-databind · Current version 2.10.0 · https://javadoc.io/doc/com.fasterxml.jackson.core/jackson-databind/2.10.0 · package-list path (used for javadoc generation ...