Spring Boot REST request JSON same parameter name

Question

Is there any way to find outthat input JSON contains multiple times concrete parameter in Spring REST? For instance if I have controller:

@PostMapping("/")
public void handle(@RequestBody Id id) {
    ...
}

Where object Id is classic POJO

public class Id {

    private String id;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

And in request json is sent twice parameter id

{
    "id" : "value",
    "id" : "different value"
}

is possible to find out that id was send twice?

Solution: I add to application.proeprties:

spring.jackson.parser.strict-duplicate-detection=true

One thing you could do is enable Jackson's strict validation, i.e. to complain on duplicate properties/keys etc. This might help: stackoverflow.com/questions/56052262/… — Thomas
– Thomas, Commented Mar 11, 2021 at 9:15
It rewrite first id parameter with second one. I check link you sent. — Roman
– Roman, Commented Mar 11, 2021 at 9:42
Note that the link I've sent is just about how to enable those properties/features for Jackson but it does not cover the one you actually need. Refer to the Jackson documentation for what features are available, e.g. FAIL_ON_READING_DUP_TREE_KEY — Thomas
– Thomas, Commented Mar 11, 2021 at 9:49
I tried this one you mentioned but not working in Spring Boot rest, only in custom deserialization. But with your help I found something similiar which solved this issue. I used in properties spring.jackson.parser.strict-duplicate-detection=true which throws json parser exception. Thank for help — Roman
– Roman, Commented Mar 11, 2021 at 11:31

Roman · Accepted Answer · 2021-11-24 10:08:12Z

1

To handle duplicities set in application.proeprties

spring.jackson.parser.strict-duplicate-detection=true

with this settings application will throw on duplicity parameter

com.fasterxml.jackson.core.JsonParseException: Duplicate field 'id'

answered Nov 24, 2021 at 10:08

Roman

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