I'm receiving invalid value for Byte
field during deserialization.
Json:
{"byteField" : 128 }
Java:
class Dto {
private Byte byteField;
... getter/setter
}
After deserialization I'm receiving Dto.byteField
= -128
I found next code in Jackon-core library v.2.11.0 in com.fasterxml.jackson.core.JsonParser#getByteValue
public byte getByteValue() throws IOException {
int value = getIntValue();
// So far so good: but does it fit?
// [JACKSON-804]: Let's actually allow range of [-128, 255], as those are uniquely mapped
// (instead of just signed range of [-128, 127])
if (value < MIN_BYTE_I || value > MAX_BYTE_I) {
throw new InputCoercionException(this,
String.format("Numeric value (%s) out of range of Java byte", getText()),
JsonToken.VALUE_NUMBER_INT, Byte.TYPE);
}
return (byte) value;
}
but not able to find issue JACKSON-804 as well as any discussion about byte range.
Question:
Java doesn't allow unsigned bytes, but the unsigned binary representation of 128
is the same as the two's complement of -128
; they're both 0b10000000
.
What Jackson is doing is allowing you to decide the semantics of this field: This can either be an 8-bit unsigned byte, or it can be an 8-bit signed byte. It's counter-intuitive, and arguably incorrect, but that's pretty clearly the intent here.
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