如何使用Jackson的ObjectMapper.readerForUpdating忽略某些字段

Question

I'm using Jackson 2.7.0

I'm trying to ignore encodingType when updating an existing object with some new values:

ObjectMapper om = new ObjectMapper();
om.readerForUpdating(message).readValue(messageSubset);

message contains a value for encodingType .
messageSubset (JSON-string) does not contain an entry (no key-value) for encodingType .

What I've tried:

• For the ObjectMapper:
  • om.setSerializationInclusion(Include.NON_EMPTY);
• On the message class:
  • @JsonIgnoreProperties(ignoreUnknown = true)
  • @JsonIgnoreProperties(value = { "encodingType" })
  • @JsonInclude(Include.NON_EMPTY)
  • @JsonInclude(Include.NON_NULL)
• On the field and on the getters/setters:
  • @JsonInclude(Include.NON_EMPTY)
  • @JsonInclude(Include.NON_NULL)
  • @JsonIgnore
  • @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

Non of the above work! Any help?
I suppose this has something to do with readerForUpdating and/or the fact that one of them is being updated.

Answer 1

I fixed the problem by configuring the ObjectMapper like this (not sure if these are all needed though):

om.setSerializationInclusion(JsonInclude.Include.NON_EMPTY); om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); om.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);

And on the Message class for the properties needed:

@JsonIgnore on the setter (excludes it when parsing to the Java object)
@JsonProperty on the getter (includes it when parsing to the JSON object)