I discovered that Jackson under some circumstances would map private fields
even though visibility is set to public only. See below very simple
convertValue unit test example where I would expect r1 and r2 to have 2
different values, since I assumed that Jackson wouldn't map public getters
to their internal private fields when visibility is public only. I found a
similar issue with private set methods where it would attempt to create
internal deserializers for these setters and in turn cause exceptions when
the parameter was not serializable. Sure, I can workaround this using
JsonIgnore annotations, but is this really suppose to work like that or is
this maybe a bug? I tested this with versions 2.9.8 and 2.10.4.
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.junit.Assert;
import org.junit.Test;
import java.util.UUID;
public class JacksonPrivatePropertyAccessTest {
public static class RandomId {
private String id = UUID.randomUUID().toString();
public String getId() {
return id;
}
}
@Test
public void noPrivateAccess() {
RandomId r1 = new RandomId();
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.FIELD,
JsonAutoDetect.Visibility.PUBLIC_ONLY);
RandomId r2 = mapper.convertValue(r1, RandomId.class);
Assert.assertNotEquals(r1.getId(), r2.getId());
}
}
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