如何让Jackson忽略使用自定义KeyDeserializer反序列化失败的密钥？

Question

I'm deserializing a Map with Jackson using a custom key deserializer that transforms the key before using it. I'd like to avoid null keys, so I'm trying to configure Jackson to just discard that entry and keep going, but I can't seem to find the right annotation. I annotating my map property with @JsonInclude , @JsonIgnoreProperties , and @JsonFilter with no luck.

ObjectMapper mapper = new ObjectMapper();

System.out.println(mapper.readValue("{ \"map\": { \"0\": \"zero\", \"1\": \"one\" } }", Test.class).map); // Works
System.out.println(mapper.readValue("{ \"map\": { \"0\": \"zero\", \"one\": \"one\" } }", Test.class).map); // Fails

Here's the class I'm deserializing:

public class Test {
    @JsonDeserialize(keyUsing = StringIntKeyDeserializer.class, contentAs = String.class)
    public Map<Integer, String> map;
}

And my KeyDeserializer

public class StringIntKeyDeserializer extends KeyDeserializer {
    @Override
    public Object deserializeKey(String key, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        try {
            return Integer.parseInt(key);
        } catch (NumberFormatException e) {
            throw ctxt.weirdKeyException(Integer.class, key, e.toString());
        }
    }
}

Answer 1

在StringIntKeyDeserializer ，不引发异常，而返回null