Hi,

I'm a newbie.

When validating a class, how to use values of dynamic parameters into a validation error message?

I explain, I want to take into account parameters which will be included into the text of the message referenced by EXCEPTION_ID into a resource file. What is the best mean to do please?

1) @FilenameUnicity(message = "EXCEPTION_ID", groups = {
Default.class, Specific.class })
So in my resource file, I have EXCEPTION_ID = The file %s is already exist
The %s is the value to replace.

2) MessageInterpolator???

Thanks a lot.

Hi,

Somebody can help me please?
No response at all, a solution must well exist, no?
Thanks.

I am not 100% sure what you want. You can dynamically change the message template by using ConstraintValidatorContext in isValid of your ConstraintValidator implementation of @FilenameUnicity.



I guess you want to insert the file name into the message. You could do that before you call buildConstraintViolationWithTemplate.

Per default Bean Validation does not allow to interpolate the actual validated values into the error message.

--Hardy

Thanks for your response.

So, if I well understand you can't do :

@FilenameUnicity(message = "EXCEPTION_ID {PropertyName} or {value}", groups = {
Default.class, Specific.class })

to take automatically the name or the value of the validated field when the interpolate function is called?

If not, can you better explain your code example please, I don't understand?

Thanks.

That's right, consraint parameters can be interpolated, for example the {min} and {max} of the @Size annotation. The property name and/or the actual property value cannot be interpolated out of the box.
The only way to do something in this direction is to do something with ConstraintValidatorContext. How exactly you go about this depends on your requirements.

--Hardy

Ok Thanks.

If you want, I can explain:

In the isValid() method, I fill a list corresponding to the parameters to insert into the message such as :

ValidatedObject aValidatedObject = new ValidatedObject(value);
ArrayList messageParameters = new ArrayList<String>();
messageParameters.add(value);
aValidatedObject.addErrorParameters(messageParameters);
ValidationErrorParameters.getInstance().addErrorParameters(
this.annotation, aValidatedObject);

A validateObject to know what my error is related parameter, for example in the case of a list of files.

After into the interpolate method, I do this:
List<String> parameters = ValidationErrorParameters.getInstance().
getErrorParameters(context.getConstraintDescriptor().
getAnnotation(),context.getValidatedValue());

The problem is the validated value returns by context.getValidatedValue() is my validated bean and not the validated property or better the value to compare with my validateObject and to recover the good error message and the linked parameters.

Implementation with ConstraintValidatorContext can do that please?

Thanks.

Hi,

to be honest, I don't understand your code examples. It seems a little out of context. It would help if you posted your ConstraintValidator implementation together with some example entity using the annotation. You could also try to format your examples a little better.

But you are right, I forgot that via MessageInterpolatorContext you have access to the validated value during the message interpolation phase. I guess that's another way of going about this. context.getValidatedValue() should return the validated value, if not there might be a bug.

Created HV-333