JSR 303 Bean Validation - Why on getter and not setter?

Question

I don\'t understand why JSR 303 (bean validation) is for the getter methods and not setter? Isn\'t it more logical to put it under setter method since that is the entry poin

Answer 1

Consider this code:

public class BeanValidation {

    private int nameSetCount = 0;
    private int nameGetCount = 0;
    private String name;

    public String getName() {
        this.nameGetCount++;
        return name;
    }

    public void setName(String name) {
        this.nameSetCount++;
        this.name = name;
    }

}

Put annotation over private String name;

Annotation identifies field easily just looking at the field.

Put annotation over public String getName()

Annotation identifies field easily just looking at the returned field.

Put annotation over public void setName(String name)

Annotation can not identify field looking at the modified field because there can be more than one.