question

I am trying to replicate the example here, under struct/SchemaDefinition. I would like to define the schema for my messages into a class called Davis which is defined as follows:

package com.example.streaming;

import lombok.Builder;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
import java.sql.Timestamp;

@Builder
@AllArgsConstructor
@NoArgsConstructor
public class Davis {
    Timestamp timestamp;
    float temperature;
}

I have imported the annotations from the Lombok project and I don't know if this is correct but Pulsar's documentation is a bit poor here. My producer class is something like this

import org.apache.pulsar.client.api.*;
import org.apache.pulsar.client.impl.schema.JSONSchema;
import java.io.IOException;

public class DavisProducer {

    public static void main(String[] args) throws IOException {
        PulsarGetPropertyValues properties = new PulsarGetPropertyValues();
        properties.getPropValues();

        PulsarClient client = PulsarClient.builder()
                .serviceUrl(properties.getProperty("pulsar.service_url"))
                .authentication(
                        AuthenticationFactory.token(properties.getProperty("pulsar.token"))
                )
                .build();

        Producer<Davis> producer = client.newProducer(JSONSchema.of(Davis.class))
                .topic(properties.getProperty("pulsar.topic"))
                .create();

        // Send a message to the topic
        producer.newMessage().value(Davis.builder()
                .timestamp(sometimestamp)
                .temp_out((float) 18.5556)
                .build()).send();

        producer.close();

        client.close();

    }
}

The code won't compile because Davis doesn't have the method builder(). What am I missing?