I have several YAML config files I want to deserialize into a class. The YAML in the files consists of simple name value pairs with no nesting. There's a handful of properties that will have explicit fields, but the rest I just want dumped into a Map.
This all works fine, but I also want all the values of the properties that get deserialized into the Map through .add()
to be run through a custom deserializer. I've tried using @JsonDeserialize
on the setter value parameter and the setter method itself but Jackson seems to ignore it altogether.
Here's how it's set up:
public class ConfigData {
private Map<String, Object> dynamicConfig = new LinkedHashMap<>();
@JsonAnyGetter
public Map<String, Object> getConfig() {
return dynamicConfig;
}
@JsonAnySetter
public void add(String name, @JsonDeserialize(using = FooDeserializer.class) Object value) {
dynamicConfig.put(name, value);
}
@JsonProperty("some_special_property")
public String setSomeSpecialProperty(String value) {
add("some_special_property", value);
}
}
And to deserialize:
public static ConfigData getConfig(URL configResource) throws IOException {
try (InputStream stream = configResource.openStream()) {
ObjectMapper mapper = new YAMLMapper();
return mapper.readValue(new InputStreamReader(stream, StandardCharsets.UTF_8), ConfigData.class);
}
}
I discovered the problem was that I was specifying the deserializer class with the using
property of the @JsonDeserialize
annotation. For this specific use case I needed to use the contentUsing
property instead, which is used for things like the value field of a Map entry.
This is what my setter looks like now:
@JsonAnySetter
@JsonDeserialize(contentUsing = FooDeserializer.class)
public void add(String name, Object value) {
dynamicConfig.put(name, value);
}
Now all the values will be serialized using FooDeserializer
, except for "some_special_property"
which has its own setter.
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