Issue Summary

Serializing a Mail object to/from JSON does not result in equivalent objects.

Steps to Reproduce

Email to = new Email("[email protected]");
Content content = new Content(MIMETYPE_HTML, "test");
Email from = new Email("[email protected]");
Mail mail = new Mail(from, "subject", to, content);

ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(mail);
Mail deserialized = mapper.readValue(json, Mail.class);

System.out.println(ReflectionToStringBuilder.toString(deserialized));
assertThat(deserialized, sameBeanAs(mail));

sameBeanAs is in the shazamcrest library and performs a recursive deep equality check.

The first issue is that the from attribute is not deserialized correctly:
com.sendgrid.Mail@401e7803[from=<null>,subject=subject,personalization=[com.sendgrid.Personalization@43a0cee9],content=[com.sendgrid.Content@eb21112],attachments=<null>,templateId=<null>,sections=<null>,headers=<null>,categories=<null>,customArgs=<null>,sendAt=0,batchId=<null>,asm=<null>,ipPoolId=<null>,mailSettings=<null>,trackingSettings=<null>,replyTo=<null>]

This seems to be because the Mail object has public attributes and non-standard getters:

public class Mail {
    @JsonProperty("from")
    public Email from;

    //...

    @JsonProperty("from")
    public Email getFrom(Email from) {
        return from;
    }

    public void setFrom(Email from) {
        this.from = from;
    }

    // ...
}

The goal is to write a Mail object to a queue so that we can have a process that manages a circuit breaker, rate limiting, retries and DLQ behavior. Right now, I can write the JSON to the queue, but it doesn't deserialize properly when being read.

Technical details:

• sendgrid-java Version: 3.2.0 from Maven Central
• Java Version: 1.8
• Jackson Version: 2.8.7