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(I published this same proposal also on the forum, and copying it here so that it does not get lost)
This is a proposal for the new version of JSR 303 (v1.1 ?).
The proposal is: modify the default message interpolation algorithm (section 4.3.1.1) so that the validation engine looks for a Resource Bundle called " {{ ValidationMessages " }} in the constraint annotation's own package.
For example, when validating constraint annotation {{ com.gdpcons.constraints.MustEqual }} , validator should also look for messages in a resource bundle called {{ com.gdpcons.constraints.ValidationMessages }} .
The constraint annotation package {{ ValidationMessages }} resource bundle should be checked after the "user" {{ ValidationMessages }} resource bundle, but before the BeanValidation provider's own private {{ ValidationMessages }} resource bundle, so as to allow users to override the string provided by the constraint annotation resource bundle.
This would allow people to write redistributable collections of constraint annotations, since as of today it's not possible to use multiple {{ ValidationMessages }} resource bundles files (one will override all the others in the classpath); and it would still allow users to override the provided messages just by a new definition for the message key in their own ValidationMessages resource bundle.
I've written an example implementation, by modifying Hibernate Validator's own {{ ResourceBundleMessageInterpolator }} . It seams to work without side effects, and is a very straightforward implementation.
See it attached to this issue.
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