Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/exc/InvalidNullException.java

package com.fasterxml.jackson.databind.exc;

import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.PropertyName;
import com.fasterxml.jackson.databind.util.ClassUtil;

/**
 * Exception thrown if a `null` value is being encountered for a property
 * designed as "fail on null" property (see {@link com.fasterxml.jackson.annotation.JsonSetter}).
 *
 * @since 2.9
 */
public class InvalidNullException
    extends MismatchedInputException // since 2.9
{
    private static final long serialVersionUID = 1L; // silly Eclipse, warnings

    /**
     * Name of property, if known, for which null was encountered.
     */
    protected final PropertyName _propertyName;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */

    protected InvalidNullException(DeserializationContext ctxt, String msg,
            PropertyName pname)
    {
        super(ctxt.getParser(), msg);
        _propertyName = pname;
    }

    public static InvalidNullException from(DeserializationContext ctxt,
            PropertyName name, JavaType type)
    {
        String msg = String.format("Invalid `null` value encountered for property %s",
                ClassUtil.quotedOr(name, "<UNKNOWN>"));
        InvalidNullException exc = new InvalidNullException(ctxt, msg, name);
        if (type != null) {
            exc.setTargetType(type);
        }
        return exc;
    }

    public PropertyName getPropertyName() {
        return _propertyName;
    }
}

⏎ com/fasterxml/jackson/databind/exc/InvalidNullException.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library