How to validate PUT requestBody for NotNull constraints only when the object key is passed-CodePudding

I am using Spring @RequestBody, and I want to use @NotNull constraints only on the keys which are present in request otherwise, not throw any error.

public class Test {
    private List<String> a;
    private String b;
}

eg 1. No Error

{
  b = "1"
}

eg 2. Error B cannot be null

{
  b = null
}

eg 3. Error A cannot be null

{
  a = null,
  b = "1"
}

I can use @NotNull constraints but that makes the keys required. I dont want the keys to be required as there are cases in which I only want to post body with { b : "1" }.

CodePudding user response：

Jackson provides an annotation that can be used on class level (@JsonIgnoreProperties(ignoreUnknown = true).

CodePudding user response：

I think your use-case needs a custom deserializer.