Convert byte[] to custom java object

Question

 private static MyClass doWork(byte[] body){        

    String data = new String(body);   
    Gson gson = new Gson();     
    final MyClass myClass = gson.fromJson(data, MyClass .class);  
    System.out.println("outsideLead"+myClass);
    return myClass;
}

byte[] body = {"N":"string","A":"string"}

When i try to convert my Byte[] to object of MyClass type, it throws me a error, that json object is expected instead a json primitive was found. What is the correct way of doing it??

a json primitive was found? you're aware that Java doesn't have primitives of json type, right? — Stultuske
– Stultuske, Commented Sep 17, 2018 at 6:18
Expected a com.google.gson.JsonObject but was com.google.gson.JsonPrimitive - this is the error — Aarika
– Aarika, Commented Sep 17, 2018 at 6:20
Please post your MyClass class and update the question with that error. — Kartik
– Kartik, Commented Sep 17, 2018 at 6:22
have a look at this: stackoverflow.com/questions/43644376/… — Stultuske
– Stultuske, Commented Sep 17, 2018 at 6:22
@Stultuske its gson error saying that myclass declares some field to be an object, but it is a value - number, or string eg — Antoniossss
– Antoniossss, Commented Sep 17, 2018 at 6:35

Dakshinamurthy Karra · Accepted Answer · 2018-09-17 06:36:03Z

1

I guess your byte[] body doesn't contain the '{' and '}'. Try something like the following and it should work:

byte[] body = "{\"N\":\"string\",\"A\":\"string\"}".getBytes();

The error just says that instead of finding a JSON object (that always starts with a '{') - the parser got a primitive - I guess the string "N".

answered Sep 17, 2018 at 6:36

Dakshinamurthy Karra

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6 Comments

Aarika Over a year ago

Thank you it works like a charm, but since my string in the program is dynamic i should write a regular expression to append escape character in front of double quotes, how do i do it

Aarika Over a year ago

String data1 = new String(body1); data1 = data1.replaceAll("\"", "\\\"");

Aarika Over a year ago

I tried something like this and it throws me a error:om.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path

Dakshinamurthy Karra Over a year ago

You dont need to use "\" in the String. It is required only when you use it literally in Java code.

Aarika Over a year ago

While then it throws me the above error when i pass it dynamically

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