How do you ignore unknown properties during deserialization with Jackson?
A) By using the @JsonIgnoreProperties annotation
B) By setting a flag in the JSON
C) By using the @JsonProperty annotation
D) By overriding the toString() method
Answer:
A) By using the @JsonIgnoreProperties annotation
Explanation:
In Jackson, you can ignore unknown properties during deserialization by using the @JsonIgnoreProperties annotation. This annotation can be applied at the class level to specify that any properties not recognized by the Java object should be ignored.
For example:
@JsonIgnoreProperties(ignoreUnknown = true)
public class SomeClass {
private String name;
// other fields
}
In this example, if the JSON data contains properties that are not mapped to fields in the SomeClass object, those properties will be ignored during deserialization, preventing errors.