I've a POJO with Jackson annotations
public class Sample{
private String property1;
@JsonIgnore
private String property2;
//...setters getters
}
So, when Jackson library is used for automarshalling by other frameworks such as RestEasy these annotations help guide the serialization and deserilization process.
But when I want to explicitly serialize using ObjectMapper mapper = new ObjectMapper(), I don't want those annotations to make any effect, instead I will configure the mapper object to my requirement.
So, how to make the annotations not make any effect while using ObjectMapper?
ObjectMapper; ObjectMapper objectMapper = new ObjectMapper(); objectMapper. configure(DeserializationFeature. FAIL_ON_UNKNOWN_PROPERTIES, false); This will now ignore unknown properties for any JSON it's going to parse, You should only use this option if you can't annotate a class with @JsonIgnoreProperties annotation.
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.
The Jackson @JsonIgnore annotation can be used to ignore a certain property or field of a Java object. The property can be ignored both when reading JSON into Java objects and when writing Java objects into JSON.
In Jackson, we can use @JsonInclude(JsonInclude. Include. NON_NULL) to ignore the null fields.
Hi if you are using com.fasterxml.jackson then code is -
ObjectMapper mapper = new ObjectMapper().configure(MapperFeature.USE_ANNOTATIONS, true);
Configure your ObjectMapper
not to use those Annotations, like this:
ObjectMapper objectMapper = new ObjectMapper().configure(
org.codehaus.jackson.map.DeserializationConfig.Feature.USE_ANNOTATIONS, false)
.configure(org.codehaus.jackson.map.SerializationConfig.Feature.USE_ANNOTATIONS, false);
This works!
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