CODEWITHSUNDEEP
javaspringrestvalidation
Rajat Goel
Rajat Goel

Reputation: 173

how to prevent user from entering decimal values in integer fields in REST APIs in spring in java

Spring is automatically converting Decimal values to Integers while sending data through body of POST Method in REST APIs. While, I want to throw a custom exception if user enters Decimal values. Is there any easy way to do this.

Eg:: If user enters age = 4.3 , then Spring is converting it to 4.

Upvotes: 2

Views: 2997

Answers (2)

Milos
Milos

Reputation: 404

Actually there is a way of preventing user from entering decimal numbers in place of an integer. You can do it this way.

@JsonProperty("age")
@NotNull
@Min(value = 0L, message = "The value must be positive")
@Digits(integer = 10, fraction = 0)
private BigDecimal age;

Basically, you should change the type from int to the BigDecimal, becasue BigDecimal itself supports @Digits annotation, and this way, you can limit the field to only accept 0 decimal points as this example shows. If the user entered decimal value instead of integer, he will recieve 400 Bad Request.

Upvotes: 4

dtrihinas
dtrihinas

Reputation: 466

if (age instanceof Integer) //dowork();
else //throw custom exception

consider age as type Object and then use the above code to do your testing.

Upvotes: 0

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