jackson deserialization anysetter NPE - jackson

Question

#JsonInclude(JsonInclude.Include.NON_NULL)
public class Payer{
private String name;
#JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
#JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
#JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
When I use objectmepper.readValue(json_string, Payer.class) with following json string:
{
"name": "fakeName",
"state": "verifird"
}
I get NPE. Since I have #JsonAnySetter, the state string should be put into additionalProperties, I'd like to know why do I get NPE here?

Answer 1

Include getter and setter for name in Payer class:
#JsonInclude(JsonInclude.Include.NON_NULL)
class Payer{
private String name;
#JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
#JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
#JsonAnySetter
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Parse the Json:
public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
ObjectMapper mapper = new ObjectMapper();
String json_string = "{\n" +
" \"name\": \"fakeName\",\n" +
" \"state\": \"verifird\"\n" +
"}";
Payer readValue = mapper.readValue(json_string , Payer.class);
System.out.println(readValue.getName());
System.out.println(readValue.getAdditionalProperties());
}
Output:
fakeName
{state=verifird}