is there a way of handling this Attribute value must be constant error?

Question

I'm trying to invoke this method:

public Response getWithPathParam(@ApiParam( 
        value = "Service group to check",
        allowableValues = ApiConstants.components,                                                   
        required = true )

but want that allowableValues attribute will get a value that can be varying.

what I mean that I assuming allowableValues is a String.

I wondering if there is a way of reading a string from configuration and pass it into the attributes.

my attempt so far just led into the error of:

"Attribute value must be constant"

can you help please?

Is going to be hard to help you if you don't provide a [sscce](http://sscce.org/)... — ΦXocę 웃 Пepeúpa ツ, Jun 07 '17 at 12:33
Are you trying to assign value to final field .Can you please provide your code. — gati sahu, Jun 07 '17 at 12:34
"this method"? Where is the method? The attribute `allowableValues` is an attribute of *what*? What context of the word "attribute" are you referring to? In short, your question is very, very unclear. — RealSkeptic, Jun 07 '17 at 12:34
He probably means "The value for annotation attribute must be a constant expression” error. — Mike Nakis, Jun 07 '17 at 12:39

score 1 · Answer 1 · answered Jun 07 '17 at 12:36

Generally, compiler errors cannot be handled in any way other than fixing them. It is only runtime errors that can somehow be handled.

According to the java language specification, a parameter to an annotation must be a compile-time constant.

This means that you cannot do anything even remotely close to what you are trying to do.

score 0 · Answer 2 · answered Jun 07 '17 at 12:54

0

Java prevents to accept any other annotation parameter other than a constant, so you need to change ApiConstants.components to be a fixed value, for example:

  class ApiConstants{
     public static final String[] CONSTANTS = {"VAL_1","VAL_2"};
  }

If you still want to stay with dynamic configuration, then you need to handle it within the method itself.

answered Jun 07 '17 at 12:54

Beri

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but if the method is a 3rd party. – roman Jun 07 '17 at 13:11
there is no way to inject it? – roman Jun 07 '17 at 13:11
Only aspect programming, but if you will go that way,, it means your design is wrong – Beri Jun 07 '17 at 13:14
https://stackoverflow.com/questions/14268981/modify-a-class-definitions-annotation-string-parameter-at-runtime – Beri Jun 07 '17 at 14:04

is there a way of handling this Attribute value must be constant error?

2 Answers2