How to Validate Collection of Date with Specific Format In Spring Boot

Question

I'm using spring data validation and i want to validate Set or List of Date but all the examples that i saw before were validating single value, Here is request class representation

CircuitJurisdictionRequest.java

package eg.intercom.ppo.revamp.model.to.request;

import com.fasterxml.jackson.annotation.JsonFormat;
import eg.intercom.ppo.revamp.model.enums.AppliedLawEnum;
import eg.intercom.ppo.revamp.model.enums.TimeStatusEnum;
import eg.intercom.ppo.revamp.model.to.RequestActivationStatus;
import jakarta.validation.constraints.*;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.time.LocalDate;
import java.util.Date;
import java.util.Set;

@Data
@NoArgsConstructor
public class CircuitJurisdictionRequest {
    @NotNull(message = "Circuit ID is required")
    @Positive(message = "Circuit ID Must Be >= 1")
    private Long circuitId;

    @NotNull(message = "Table type ID is required")
    @Positive(message = "Table type ID Must Be >= 1")
    private Long tableTypeId;

    @NotNull(message = "Court room ID is required")
    @Positive(message = "Court room ID Must Be >= 1")
    private Long courtRoomId;

    @NotNull(message = "Applied law is required")
    private AppliedLawEnum appliedLaw;

    @NotNull(message = "Time status is required")
    private TimeStatusEnum timeStatus;

    @Size(max = 10, message = "Session day should not exceed 10 characters")
    @Pattern(
            regexp = "^(SUNDAY|MONDAY|TUESDAY|WEDNESDAY|THURSDAY|FRIDAY|SATURDAY)$",
            message = "Session day must be a valid day of the week (e.g., SUNDAY, MONDAY, etc.)"
    )
    private String sessionDay;
    
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy")
    private Set<@NotNull(message = "Each date in Session Scheduler must not be null") Date> sessionScheduler;

    @NotNull(message = "new Cases Capacity is required")
    @Min(value = 0, message = "New cases capacity must be zero or positive")
    @Max(value = 1000, message = "New cases capacity should not exceed 1000")
    private Integer newCasesCapacity;

    @NotNull(message = "postponed Cases Capacity is required")
    @Min(value = 0, message = "Postponed cases capacity must be zero or positive")
    @Max(value = 1000, message = "Postponed cases capacity should not exceed 1000")
    private Integer postponedCasesCapacity;

    @NotNull(message = "first Session Date is required")
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy")
    private LocalDate firstSessionDate; // Optionally add @Future or @NotNull if required

    @NotEmpty(message = "At least one digital Jurisdiction is required")
    private Set<@Min(value = 0, message = "Digital Jurisdiction Must be >= 0")
    @Max(value = 9, message = "Digital Jurisdiction Must be <= 9") Integer> digitalJurisdiction;

    private RequestActivationStatus activationStatus;
}

What i Want

i want to validate all dates into sessionScheduler to be sent in the request as json string with format dd-MM-yyyy

    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy")
    private Set<@NotNull(message = "Each date in Session Scheduler must not be null") Date> sessionScheduler;

Answer 1

The Following Works Correctly for me and the following info is

1- @JsonFormat check over each element of the Collection to be in the format dd-MM-yyyy

2- added @Future to check that sent date into the future


    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy") // to ensure that the date format sent in dd-MM-yyyy
    private Set<@NotNull(message = "Each date in Session Scheduler must not be null")
                @Future(message = "Each Session Scheduler Date must be In Future") LocalDate> sessionScheduler;