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

Jackson Annotations Source Code files are provided in the source packge (jackson-annotations-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

⏎ com/fasterxml/jackson/databind/deser/impl/FailingDeserializer.java

package com.fasterxml.jackson.databind.deser.impl;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

/**
 * Special bogus "serializer" that will throw
 * {@link com.fasterxml.jackson.databind.exc.MismatchedInputException} if an attempt is made to deserialize
 * a value. This is used as placeholder to avoid NPEs for uninitialized
 * structured serializers or handlers.
 */
public class FailingDeserializer extends StdDeserializer<Object>
{
    private static final long serialVersionUID = 1L;

    protected final String _message;

    public FailingDeserializer(String m) {
        this(Object.class, m);
    }

    // @since 2.12
    public FailingDeserializer(Class<?> rawType, String m) {
        super(rawType);
        _message = m;
    }
    
    @Override
    public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
        ctxt.reportInputMismatch(this, _message);
        return null;
    }
}

⏎ com/fasterxml/jackson/databind/deser/impl/FailingDeserializer.java

 

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⇑⇑ Jackson - Java JSON library