Creating custom exceptions in Java

public class DBConflictException extends Exception {
    Date date;
    int errorCode;

    public DBConflictException(Date date, int errorCode) {
        super("DB record Conflict Exception " + errorCode); (1)
        this.date = date;
        this.errorCode = errorCode;
    }

}

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "Could not find this resource on server")
public class ResourceNotFoundException extends RuntimeException {

    public ResourceNotFoundException(String reason) {
       super(reason);
    }
}