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In the example
class Person { String name; int age; } If the JSON object has a missing property 'age',
{ "name": "John" } Person person = objectMapper.readValue(jsonFileReader, Person.class); it throws a JsonMappingException saying it cannot deserialize. Is there an annotation to ignore missing fields during deserialization?
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Jackson API provides two ways to ignore unknown fields, first at the class level using @JsonIgnoreProperties annotation and second at the ObjectMapper level using configure() method.
To ignore individual properties, use the [JsonIgnore] attribute. You can specify conditional exclusion by setting the [JsonIgnore] attribute's Condition property. The JsonIgnoreCondition enum provides the following options: Always - The property is always ignored.
If there are fields in Java objects that do not wish to be serialized, we can use the @JsonIgnore annotation in the Jackson library. The @JsonIgnore can be used at the field level, for ignoring fields during the serialization and deserialization.
You can ignore null fields at the class level by using @JsonInclude(Include. NON_NULL) to only include non-null fields, thus excluding any attribute whose value is null. You can also use the same annotation at the field level to instruct Jackson to ignore that field while converting Java object to json if it's null.
@JsonIgnoreProperties(ignoreUnknown = true) on the class level worked for me.
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