NoClassDefFoundError com/fasterxml/jackson/core/TreeNode -- json schema validation

Question

Getting the below mention exception in json-schema-validator 2.1.7 jar:

java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/TreeNode
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466)

I am using:

• json-schema-validator 2.1.7 jar
• json-schema-core 1.1.8 jar
• jackson-coreutils 1..0 jar
• jackson-databind-2.2.2 jar

Code snippet is given below:

            System.out.println(" inside json validation -- 0");
            JsonNode data = JsonLoader.fromString(responseString);
            System.out.println(" inside json validation -- 1");
            JsonNode jsonSchema = JsonLoader.fromResource(schemafilePath);
            System.out.println(" inside json validation -- 2");
            JsonSchemaFactory factory = JsonSchemaFactory.byDefault();
            System.out.println(" inside json validation -- 3");
            JsonSchema schema = factory.getJsonSchema(jsonSchema);
            System.out.println(" inside json validation -- 4");
            ProcessingReport report = schema.validate(data);

Answer 1

If I recall correctly jackson-databind has a transitive dependency to jackson-core where TreeNode should be. Check your .m2 folder for the presence of:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.2.2</version>
</dependency>

and if it's there I agree that you might have a classpath problem, such as a previous version of jackson-core first in the classpath.

Cheers,

Answer 2

[ + ] libs/jackson-core-2.9.9.jar