JSON parsing for POJO using LocalDateTime using Jackson "Unexpected token (START_OBJECT), expected VALUE_STRING: expected array or string".

Question

I read a lot of posts here about JSON analysis on Java objects and worked great with parsings until I introduced LocalDateTime. I tried to use the Java 8 parser, the JSR310 module and create a customization - below describing the roadblocks on each. Any help would be appreciated!

This is my JSON line created by Jackson from another POJO:

{"validEscortsWTheirSpecReqs":"MAYBE",
 "modifiedDateTimeNeedToBeThere":     
    {"dayOfMonth":6,"dayOfWeek":"MONDAY","month":"FEBRUARY","year":2017,
     "hour":10,"minute":1,"second":24,"nano":0,"dayOfYear":37,"monthValue":2,
     "chronology":{"id":"ISO","calendarType":"iso8601"}
    }
}

which generates

com.fasterxml.jackson.databind.JsonMappingException: Unexpected token (START_OBJECT), expected VALUE_STRING: Expected array or string. at 
...
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
    at com.fasterxml.jackson.databind.DeserializationContext.wrongTokenException(DeserializationContext.java:1376)
    at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:118)
    at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:39)
...

called from:

ComputeArrive response = mapper.readValue (responseString, ComputeArrive.class);

The answer has the following fields:

Logger logger// JSON, / serialVersionUID = 1L;// " validEscortsWTheirSpecReqs =" YES"// LocalDateTime modifiedDateTimeNeedToBeThere//

, , , , :

    mapper.findAndRegisterModules();
    //mapper           .registerModule(new ParameterNamesModule());
    mapper.registerModule(new Jdk8Module());
    mapper.registerModule(new JavaTimeModule());
    mapper.registerModule(new JSR310Module());

, Spring JSR310 ( , ):

@Configuration
public class JacksonConfig {

    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        objectMapper.configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false);
        return objectMapper;
    }
}

, - "" . "Jackson2ObjectMapperBuilder" , :

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-expression</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>4.3.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>aopalliance</groupId>
    <artifactId>aopalliance</artifactId>
    <version>1.0</version>
</dependency>   

"Jackson2ObjectMapperBuilderCustomizer", "Jackson2ObjectMapperBuilder" - . , , , , , Spring .

, , .

Answer 1

JavaTimeModule Jackson2ObjectMapperBuilder :

@Configuration
public class MyConfiguration {

    @Bean
    @Primary
    public Jackson2ObjectMapperBuilder objectMapperBuilder() {
        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
        return builder.modulesToInstall(new JavaTimeModule());
    }

}

Spring .

Answer 2

, LocalDate, :

{
    "validEscortsWTheirSpecReqs":"MAYBE",
    "modifiedDateTimeNeedToBeThere":[6,2,2017]
}

, , .