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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.jackson.ser;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;
import java.time.Instant;

/**
 * Jackson serializer that converts an {@link Instant} into milliseconds since the epoch.
 */
public class InstantEpochTimeSerializer extends StdSerializer {

    /**
     * Create a new instance that serializes {@link Instant} to epoch millis.
     */
    public InstantEpochTimeSerializer() {
        super(Instant.class);
    }

    @Override
    public void serialize(Instant value,
                          JsonGenerator jsonGenerator,
                          SerializerProvider provider) throws IOException {

        jsonGenerator.writeNumber(value.toEpochMilli());
    }
}