What does this error mean? java.lang.reflect.InaccessibleObjectException: Unable to make field private final int java.time.LocalDate.year

Question

I'm trying to make a method, which uses the Json data with jackson library to have a list of objects. If I run my code, I get the error:

java.lang.reflect.InaccessibleObjectException: Unable to make field private final int java.time.LocalDate.year accessible: module java.base does not "opens java.time" to unnamed module @5c90e579

Why is it giving me an error about LocalDate even though I have JodaModul in my Code?

public static List<Tweet> getTweetsFile() throws Exception{

            ObjectMapper mapper = new ObjectMapper().
                    registerModule(new JodaModule()).
                    configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
            
            File path = new File ("C:/Users/PC/eclipse-workspace/hw4/tw.json");

            List<Tweet> myObjects3 =  Arrays.asList(mapper.readValue(path, Tweet.class));
    
            return myObjects3;
    }

How it looks in my File:

[{"date":"2001-12-28","tweetNumber":1,"country":"England","comments":11,"message":"I like to watch anime and reading books","retweets":3,"username":"Isabelle","likes":55},{"date":"2003-05-11","tweetNumber":2,"country":"France","comments":25,"message":"I'm Viatnamese, but I live in France","retweets":30,"username":"Vin","likes":110}..

It's not in the right order like my Object has in their constructor, could that be the reaseon?

Answer 1

You can fix this issue on your own.

add --add-opens java.base/java.time=ALL-UNNAMED as start-argument and it'll work.

Here is the corresponding JEP

Answer 2

I used this way and fixed this Problem. Firstly you have to create LocalDateTime Deserializer with the given Date Format in your Json Data.

class LocalDateTimeDeserializer implements JsonDeserializer < LocalDateTime > {
    
    @Override
    public LocalDateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        return LocalDateTime.parse(json.getAsString(), DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss").withLocale(Locale.ENGLISH));
    }

}

Then create Object of Type GsonBuilder and adapt it with your LocalDateDeserializer.

gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDateTimeDeserializer());

Gson gson = gsonBuilder.setPrettyPrinting().create();