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From: Cecil Westerhof <Cecil@decebal.nl>
Newsgroups: comp.lang.java.programmer
Subject: What is the meaning of these two required fields
Date: Thu, 30 Jul 2015 09:52:59 +0200
Organization: Decebal Computing
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I wrote my own annotation:
    // public
    @Documented
    @Constraint(validatedBy = {})
    @Target({ FIELD })
    @Retention(RUNTIME)
    @ReportAsSingleViolation
    @NotNull
    @Size(min = 1)
    public @interface NotEmpty {
        // default
        Class<?>[]                  groups()  default   { };
        String                      message() default  "Field should be filled";
        Class<? extends Payload>[]  payload() default  {};
    }

I understand the reason for message: that is the message for when
there is a validation constraint.

But what are the reasons for groups and payload?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof