CODEWITHSUNDEEP
javavalidationspring-mvc
blackpanther
blackpanther

Reputation: 11486

Does the following validation mean that the field cannot be null? ( @Size annotation )

I have the following property in my Spring MVC Form bean using the javax.validation.constraints to validate the form bean as follows:

public class MyForm {
    @Size(min = 2, max = 50)
    private String postcode;

    // getter and setter for postcode.
}

My question is: Does the @Size(min = 2) mean that the property cannot be null as it will always require a length greater than 2. The reason why I say that is because there is a @NotNull constraint in the same package and therefore does that make the @NotNull constraint redundant if I should use it in the above bean.

Upvotes: 26

Views: 23394

Answers (3)

mavarazy
mavarazy

Reputation: 7735

According to documentation for @Size

null elements are considered valid.

For reference hibernate-validation actual @Size implementations are in:

org.hibernate.validator.constraints.impl.SizeValidator

So specify @NotNull anyway.

Upvotes: 2

cloudy_weather
cloudy_weather

Reputation: 2977

If you look at the documentation of the annotation Size (http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Size.html)

You can read "null elements are considered valid."
Therefore you need to specify @NotNull on the top of your field.
You have two alternatives:

@NotNull 
@Size(min = 2, max = 50)
private Integer age;

Or like Riccardo F. suggested:

@NotNull @Min(13) @Max(110)
private Integer age;

Upvotes: 33

Ricardo
Ricardo

Reputation: 67

@NotNull is used for text fields too but you can use them together like

@NotNull @Min(13) @Max(110)
private Integer age;

That means age cannot be null and must be a value between 13 and 100 and

@NotNull
private Gender gender;

Means the gender cannot be null

Upvotes: 2

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