Difference between @size(max = value ) and @min(value) and @max(value)

@Min and @Max are used for validating numeric fields which could be String(representing number), int, short, byte etc and their respective primitive wrappers.

@Size is used to check the length constraints on the fields.

As per documentation @Size supports String, Collection, Map and arrays while @Min and @Max supports primitives and their wrappers. See the documentation.

package com.mycompany;import javax.validation.constraints.Min;import javax.validation.constraints.NotNull;import javax.validation.constraints.Size;public class Car {    @NotNull    private String manufacturer;    @NotNull    @Size(min = 2, max = 14)    private String licensePlate;    @Min(2)    private int seatCount;    public Car(String manufacturer, String licencePlate, int seatCount) {        this.manufacturer = manufacturer;        this.licensePlate = licencePlate;        this.seatCount = seatCount;    }    //getters and setters ...}

@NotNull, @Size and @Min are so-called constraint annotations, that we use to declare constraints, which shall be applied to the fields of a Car instance:

manufacturer shall never be null

licensePlate shall never be null and must be between 2 and 14 characters long

seatCount shall be at least 2.

From the documentation I get the impression that in your example it would be intended to use:

@Range(min= SEQ_MIN_VALUE, max= SEQ_MAX_VALUE)

Checks whether the annotated value lies between (inclusive) the specified minimum and maximum.Supported data types:

BigDecimal, BigInteger, CharSequence, byte, short, int, long and therespective wrappers of the primitive types