Using properties file constants as annotation values - spring-boot

Question

I'm successfully loading messages for validation constraints from my properties file/s (i18n) but as I'm writing client side validation it's becoming clear that one source for both messages and constraint values could make the whole process less cumbersome.
In short: is there any way to load a value such as 20 for the size annotation from the properties file?
#Size(max=20)
private String password;
I have tried lines like:
#Size(max="${constraint.value}")
// or
#Size(max=Integer.valueOf("#{constraint.value}"))
But the value needs to be an Integer and a constant.
Edit1:
The client-side validation logic is done all over again in a form of a separate library, just the values like (5,10) for (min,max) are sticking out. (Using thymeleaf)
<script type="text/javascript" xmlns:th="http://www.thymeleaf.org" th:inline="javascript">
//...
// reading message from properties file
/*<![CDATA[*/
var errMessage = /*[[#{Size.user.userName}]]*/ 'default';
/*]]>*/
// adding a constraint to validationObj linked with one <input> element
validationObj.addSizeConstraint(ft.keyup,5,10,errMessage);
//...
</script>
Edit2:
Thanks to #Pavel Horal comment i made it work like this:
On the server side:
public static final int USERNAME_MAX_SIZE=20;
#Size(max=USERNAME_MAX_SIZE)
private String userName;
On the client side (or to the client side since it's preprocessed on the server side with thymeleaf) I'm getting this value like this:
<script type="text/javascript" xmlns:th="http://www.thymeleaf.org" th:inline="javascript">
//...
/*<![CDATA[*/
var value =/*[[${T(com.project.FormModel).USERNAME_MAX_SIZE}]]*/ 20;
/*]]>*/
//...
</script>
Which in my view is a better solution since I'm keeping all the values outside of javascript code. Thanks!

Answer 1

#Size annotation's max parameter only accepts an integer, so the below will not work anyway.
#Size(max="${constraint.value}")
On the other hand below also not working. "#{constraint.value}" will not resolve value from your property file. Also "${constraint.value}" will not work here too.
#Size(max=Integer.valueOf("#{constraint.value}"))
And for all annotations, annotation parameters should be constants by definition. So I actually can't imagine a potential solution for your problem.