Stack overflow exception when i use strategy for Gson

Question

i m trying to save an object to a file as json string ! but when i try to do it without ExclusionStrategy for GsonBuilder it gives me an "duplicated name in Json Exception field hashCode_ in my class" ! i search in google and found a solution that i should use ExclusionStrategy and skip some feilds ! so i did that and i got Stack overflow exception this time ! i dont know what to do and there seems to be no answers to this question on Internet !

this is my convertToJsonString Method :

public static <E> String convertToJsonString(E e) {

    ExclusionStrategy strategy = new ExclusionStrategy() {
        @Override
        public boolean shouldSkipField(FieldAttributes f) {
            if(f.getName().equals("hashCode_"))
                return true;

            return false;
        }

        @Override
        public boolean shouldSkipClass(Class<?> clazz) {
            return false;
        }
    };
    gson=new GsonBuilder().setExclusionStrategies(strategy).create();
    return gson.toJson(e);
}

this is where i make JsonElement

   public static <E> JsonElement createJsonElement(E e) {
      return gson.toJsonTree(e);
   }

and this is where i save my jsonString to a file :

   public void writeToFileHotel(Hotel hotel) {

   JsonElement element= JsonUtils.createJsonElement(hotel);
    JsonUtils.writeJsonToFile(element,allGiataHotels_File);
}

this is my exception without ExclusionStrategy

  Exception in thread "main" java.lang.IllegalArgumentException: class 
  ir.viratech.tickbed.model.user.AgencyUser declares multiple JSON fields 
  named hashCode_

this is my exception with ExclusionStrategy

  Exception in thread "main" java.lang.StackOverflowError

note : IllegalArgumentException exception accured on JsonElement element= JsonUtils.createJsonElement(hotel) line

is it incorrect ? if it is what is the correct code? @jeevanswamy21 — Mohammad javani, Apr 04 '18 at 09:06
already ur converting then return pass value gson.fromJson(json) — jeevanswamy21, Apr 04 '18 at 09:09
@jeevanswamy21 yes u r right i corrected it but still getting IllegalArgumentException declares multiple JSON fields named hashCode_ !!! — Mohammad javani, Apr 04 '18 at 09:14
where u declare this one allGiataHotels_File how will u getting — jeevanswamy21, Apr 04 '18 at 09:16
Possible duplicate of https://stackoverflow.com/questions/10209959/gson-tojson-throws-stackoverflowerror — DAIRAV, Apr 04 '18 at 09:17
@jeevanswamy21 its final string of my absoluthfile path in my class fields !! — Mohammad javani, Apr 04 '18 at 09:26

score 0 · Answer 1 · answered Apr 04 '18 at 09:16

0

Stackoverflow error occurs when there is a circular dependency on your object.

You might require to use TypeAdapter

answered Apr 04 '18 at 09:16

DAIRAV

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Stack overflow exception when i use strategy for Gson

1 Answers1