GWT validation i18n - validation

Question

I was hoping following might work:
#Size(min = 1, message = "{my.custom.message}")
private String name;
with ValidationMessages.properties in my source path, alogn with my other text resources:
my.custom.message=it is kinda short
...yet the constraint violation still reads {my.custom.message}
Does one have to do something special to have the ValidationMessages.properties file picked up? And where is this documented please?
Apparently it should work, somehow: https://github.com/gwtproject/gwt/issues/5762

Answer 1

Thanks to TBroyer's reply I managed to make it work in my project.
In a nutshell...
...define MyCustomValidationMessages interface:
public interface MyCustomValidationMessages extends com.google.gwt.i18n.client.ConstantsWithLookup {
#DefaultStringValue("NotNull constraint violated")
#Key("notNull")
String notNull();
#DefaultStringValue("Size constraint violated")
#Key("size")
String size();
}
...create MyCustomValidationMessages.properties right next to it:
notNull=must not be null
size=must be at least {min} characters long
...define MyCustomValidationMessagesResolver class and make it use messages from MyCustomValidationMessages interface:
public class MyCustomValidationMessagesResolver extends AbstractValidationMessageResolver
implements UserValidationMessagesResolver {
public MyCustomValidationMessagesResolver() {
super(GWT.create(MyCustomValidationMessages.class));
}
}
...in your AmazingModule.gwt.xml override use of UserValidationMessagesResolver with MyCustomValidationMessagesResolver:
<replace-with class="amazing.project.client.MyCustomValidationMessagesResolver">
<when-type-is class="com.google.gwt.validation.client.UserValidationMessagesResolver"/>
</replace-with>
...apply the constraints in your DTO bean (note the curly brackets):
public class MyDto {
#NotNull(message = "{notNull}")
#Size(min = 1, message = "{size}")
private String name;
}
Voilá!
Working example is here.
If you are sure you have done everything and it just does not work try deleting GWT's temp folders and restarting your IDE. Sometimes merely rebuilding your project and restarting the codeserver (in Idea) might not be enough. #PITA