Snippet

Basic Field Validation

Spring supports Bean Validation to enforce rules on your data models. Annotations like @NotNull and @Size ensure that fields meet specific criteria before processing.

snippet.java

java

public class UserProfile {
    @NotNull
    @Size(min = 3, max = 20)
    private String username;
}

spring

Breakdown

@NotNull

Ensures the username field is never null.

@Size(min = 3, max = 20)

Constraints the username to be between 3 and 20 characters long.

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Basic Field Validation

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