java 8中的即时时间，unMarshalling中的错误

Question

当解组具有即时数据类型的对象时，我将得到以下异常。有什么建议可以解决这个问题吗？

我试图用java 8即时数据类型来解决这个问题，不喜欢转换为LocalDate或其他数据类型。

Exception in thread "main" java.lang.IllegalArgumentException: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.Instant: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
 at [Source: [{"transactionType":"ADD_DOC","payload":{"hash":"hashofthedocument12","userId":"123","meta":{"key1":"data1","key2":"data2"}},"consensusTimestamp":{"epochSecond":1522205987,"nano":533000000},"id":"2aaa3863-062d-4fcc-a789-8aad3dfade57"}]; line: 1, column: 148] (through reference chain: java.lang.Object[][0]->ipos.hashgraph.model.ConsensedDocument["consensusTimestamp"])
    at ipos.hashgraph.marshaller.JacksonMarshaller.unmarshalLenient(JacksonMarshaller.java:50)
    at ipos.hashgraph.loadtest.LoadTestor.getTransaction(LoadTestor.java:61)
    at ipos.hashgraph.loadtest.LoadTestor.main(LoadTestor.java:99)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.Instant: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
 at [Source: [{"transactionType":"ADD_DOC","payload":{"hash":"hashofthedocument12","userId":"123","meta":{"key1":"data1","key2":"data2"}},"consensusTimestamp":{"epochSecond":1522205987,"nano":533000000},"id":"2aaa3863-062d-4fcc-a789-8aad3dfade57"}]; line: 1, column: 148] (through reference chain: java.lang.Object[][0]->ipos.hashgraph.model.ConsensedDocument["consensusTimestamp"])

代码：

 ObjectMapper mapper = new ObjectMapper();
        mapper.findAndRegisterModules();
        try {
            mapper.readValue(responseEntity1.getBody(), ConsensedDocument[].class);
        } catch (IOException e) {
            e.printStackTrace();
        }

模型对象

String transactionType;
Document payload;
Instant consensusTimestamp;
UUID id;

Answer 1

您需要一个外接程序来支持JSR-310，试着遵循下面的示例：https://github.com/FasterXML/jackson-modules-java8