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I am working against a existing REST interface. One of the incoming JSON objects contains a property called size which I would like to ignore when deserializing this JSON object?
My standard behavior is to fail on unknown property, so I cannot configure the used object mapper to ignore unknown properties.
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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.
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.
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.
Overview So when Jackson is reading from JSON string, it will read the property and put into the target object. But when Jackson attempts to serialize the object, it will ignore the property. For this purpose, we'll use @JsonIgnore and @JsonIgnoreProperties.
Add the annotation @JsonIgnoreProperties("size") to your POJO. See the JavaDoc for @JsonIgnoreProperties at fasterxml.github.io for more information.
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