dev.harrel:json-schema Help

SnakeYAML

Required dependency

<dependency> <groupId>org.yaml</groupId> <artifactId>snakeyaml</artifactId> <version>2.4</version> </dependency>
implementation 'org.yaml:snakeyaml:2.4'

The newest version is always supported.

Adapter classes are:

Provider node

The JsonNode abstraction wraps a concrete class from JSON/YAML library, which is called a "provider node." It is possible to interact with the API using provider nodes directly, but there is no type information at compile time, so please ensure that you are using the correct class.

Constraints

Library is compatible with YAML 1.1 standard. However, there are few constraints:

  • all object keys are treated as strings,

  • object keys cannot be duplicated,

  • anchors and aliases are supported while override syntax (<<) is not.

Usage

Creating Validator instance

JsonNodeFactory factory = new SnakeYamlNode.Factory(); Validator validator = new ValidatorFactory() .withJsonNodeFactory(factory) .createValidator();

Using custom Yaml configuration

Yaml yaml = new Yaml(); JsonNodeFactory factory = new SnakeYamlNode.Factory(yaml); Validator validator = new ValidatorFactory() .withJsonNodeFactory(factory) .createValidator();

Converting String to JsonNode

JsonNodeFactory factory = new SnakeYamlNode.Factory(); JsonNode jsonNode = factory.create("{}");

Converting provider node to JsonNode

org.yaml.snakeyaml.nodes.Node providerNode = new Yaml().compose(new StringReader("{}")); JsonNodeFactory factory = new SnakeYamlNode.Factory(); JsonNode jsonNode = factory.wrap(providerNode);

Using Validator with provider nodes

org.yaml.snakeyaml.nodes.Node providerSchemaNode = new Yaml().compose(new StringReader("{}")); URI schemaUri = validator.registerSchema(providerSchemaNode); org.yaml.snakeyaml.nodes.Node providerInstanceNode = new Yaml().compose(new StringReader("true")); Validator.Result result = validator.validate(schemaUri, providerInstanceNode);
04 August 2025