json Can not deserialize value of type byte from String

Question

In Spring java application, I am receiving REST json request with following input where 'mode' field is defined as byte in the java class.

{
  "application": "sadsd",
  "date": "20161109",
  "mode": "A",
  "catalogId": 0,
}

pojo -

public class Test {
  String application;
  String date;
  byte mode;
  int catalogId;
...
}

getting Following error -

"exception": org.springframework.http.converter.HttpMessageNotReadableException",
  "message": "Could not read document: Can not deserialize value of type byte from String \"A\":
not a valid Byte value\n at 
[Source: java.io.PushbackInputStream@6386b197; line: xx, column: xx] 
(through reference chain: com.abc.myInput[\"mode\"]); 

`enter code here`nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException:
Can not deserialize value of type byte from String \"A\":

not a valid Byte value\n at [Source: java.io.PushbackInputStream@6386b197; line: xx, column: xx] 
(through reference chain: com.abc.myInput[\"mode\"])",`

Do i have to write serializer and deserializer here?
Are there any annotations that i can use on byte field or get/set methods of that field without writing any additional code?

Why can't the model use a String variable? JSON has no concept of a byte array. You could maybe write your setters and getters to use the constructors of the String class to use byte arrays — OneCricketeer
– OneCricketeer, Commented Nov 10, 2016 at 17:52
As model is generated and used by many others , altering datatype is not an option. — chappalprasad
– chappalprasad, Commented Nov 10, 2016 at 18:48
I know this is a little long winded but you can use GSON and write a little byte[] adapter. Check out this posting - it pretty much hands it to you. stackoverflow.com/questions/25522309/… — NastyDiaper
– NastyDiaper, Commented Nov 10, 2016 at 20:55
what if you have a file object that you're taking as a byte array? — jukebox
– jukebox, Commented Jun 6, 2019 at 6:38

chappalprasad · Accepted Answer · 2016-11-21 00:21:55Z

1

i just went ahead with declaring them as String and taking first byte from input string and converting byte to string for the output.
Thanks for the input cricket_007 and jnbbender.

answered Nov 21, 2016 at 0:21

chappalprasad

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1 Comment

Ranjit Soni Over a year ago

can you plz give example?

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