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I'm using Jackson's readValue() method on an object mapper to read from a JSON file and convert it into my java object.
eg.
mapperObject.readValue( node, MyTargetClass.class ) Are there any annotations that I can set on MyTargetClass to enforce required attributes? For example, if I have a JSON object with properties ABC,DEF and GHI, and my Json is the following
{ "ABC" : "somevalue" "DEF" : "someothervalue" } I want it to fail somehow, and only succeed on the readValue if it contained ABC, DEF and GHI.
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If you want to make sure a json field is provided, you have to use the @JsonProperty(value = "fieldName", required = true) annotation as a parameter to the constructor.
The @JsonProperty annotation is used to map property names with JSON keys during serialization and deserialization. By default, if you try to serialize a POJO, the generated JSON will have keys mapped to the fields of the POJO.
You definitely don't need all those @jsonProperty . Jackson mapper can be initialized to sereliazie/deserialize according to getters or private members, you of course need only the one you are using.
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.
You can mark a property as required with the @JsonProperty(required = true) annotation, and it will throw a JsonMappingException during deserialization if the property is missing or null.
Edit: I received a downvote for this without comment. I'd love to know why, since it does exactly the right thing.
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