Jackson Databind Change in behavior of Enums with @JsonProperty("") in 2.19

^{Originally posted by **erizzo-cfa** July 8, 2025} It seems that Jackson 2.19.x has changed the way `@JsonProperty` is treated when applied to enums. Here's a simple test to demonstrate:

import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;

class EnumJsonPropertyTest {

    static enum Color {
        @JsonProperty
        Red,
        Blue,
        Green
    }

    @Getter @Setter
    @EqualsAndHashCode
    static class Thing {
        Color color;
    }

    @Test
    void withEnumName() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        String json = """
                {"color": "Red"}
                """;
        Thing thing = mapper.readValue(json, Thing.class);

        assertThat(thing.getColor()).isEqualTo(Color.Red);
    }

    @Test
    void withBlank() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        String json = """
                {"color": ""}
                """;
        Thing thing = mapper.readValue(json, Thing.class);

        assertThat(thing.getColor()).isEqualTo(Color.Red);
    }
}

With jackson-databind 2.18.4, the test `withBlank()` fails and `withEnumName()` passes. With 2.19.0/2.19.1, it's the other way around, `withEnumName()` fails and `withBlank()` passes. Was this change intentional? According to the Javadoc of `@JsonProperty`, it seems like the behavior of 2.18.4 was actually incorrect, but I didn't see any mention of a bug like that in the release notes.