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Groups > comp.lang.java.programmer > #32204

What is the meaning of these two required fields

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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

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What is the meaning of these two required fields Cecil Westerhof <Cecil@decebal.nl> - 2015-07-30 09:52 +0200
  Re: What is the meaning of these two required fields Jeff Higgins <jeff@invalid.invalid> - 2015-07-30 04:49 -0400
  Re: What is the meaning of these two required fields Arne Vajhøj <arne@vajhoej.dk> - 2015-07-30 21:09 -0400

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