@RequestParam defaultvalue does not accept enum value as a default value

Question

I am using spring rest controller.

Here is the code.

@RequestParam(value = "status", required = false, defaultValue = StatusEnum.STATUS.toString())

If i use enum as a defaultValue i am getting The value for annotation attribute RequestParam.defaultValue must be a constant expression.

As per my understanding it should accept enum as a default value.

Please advice.

A "constant expression" is something that can be resolved at compile time. Like a static final field, a string or a number. — vanza, Jul 21 '12 at 02:13

score 31 · Accepted Answer · edited Mar 06 '19 at 12:19

31

Since it has to be a String, and it has to be a constant expression, your only real option here is to use the value that will work for Enum.valueOf(), since that's how this is eventually resolved.

Specifically, yours should read

@RequestParam(value = "status", required = false, defaultValue = "STATUS")

Assuming, of course, that "STATUS" is the string value for StatusEnum.STATUS.

edited Mar 06 '19 at 12:19

Ivar

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answered Nov 21 '13 at 02:17

biggusjimmus

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Else can use StatusEnum.STATUS.name() – Dineshmohan Jul 28 '16 at 21:24
13

@user2344797 only constant expressions are allowed. – Antoine Martin Sep 28 '16 at 15:08
3

@Dineshmohan name() does not work either. I wonder why though... cuae it has to evaluate to a string at compile time and all enum are constants by default. If anyone could explain... it woudl be great!! – Deekshith Anand Jan 31 '21 at 11:04

score 2 · Answer 2 · answered Dec 03 '21 at 14:26

A work around to avoid strings in different location is to use something like that

public enum StatusEnum {
    STATUS();
    
    public class Names {
       public static final String STATUS = "STATUS";
    }
    
 }

And in the query param

@RequestParam(value = "status", required = false, defaultValue = StatusEnum.Names.STATUS)

@RequestParam defaultvalue does not accept enum value as a default value

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