Bean validation for java.sql.Timestamp

Question

I am trying to implement custom bean validation for java.sql.Timestamp like below -

@Constraint(validatedBy = { DateTimeValidator.class })
@Target({ ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ValidDateTime {
    String format() default "yyyy-MM-dd HH:mm:ss.S";

    String message() default "{Invalid timestamp}";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };

    boolean value() default true; }

Implementation for DateTimeValidator.java

public class DateTimeValidator implements ConstraintValidator<ValidDateTime , Timestamp > {

    private String format;

    @Override
    public void initialize(ValidDateTime  validDateTime ) {
        format = validDateTime.format(); }

    @Override
    public boolean isValid(Timestamp value, ConstraintValidatorContext constraintValidatorContext) {
        if (value == null) return false;

        SimpleDateFormat sdf = new SimpleDateFormat(format);
        try {
            sdf.parse(value.toString());
        } catch (Exception e) { return false; }
        return true; }}

Field on which this annotation is applied -

@ValidDateTime(message="Invalid StartDateTime")
protected Timestamp startDateTime;

This works fine if the input value is of the format "2017-10-21T11:11:11", but if I pass any invalid value like any string(Example : "TEST_DATE") as input instead of date, this validator is not getting invoked and I get JAXB parse exception.

How to correct this implementation to invoke for all input values and validate the correct value?

Thing is that you are applying that custom constraint to already parsed data. So if you want to check the format with a constraint you probably should use a String instead of Timestamp. And in such case it'll probably would be enough to use @Pattern (no need in custom constraint and validator). Otherwise if you are using Timestamp - first data is parsed and converted to a Timestamp - which fails as a 'TEST_DATE' could not be parsed correctly ... — mark_o, Oct 03 '17 at 07:57
Thank you, I was thinking of String approach but as there are many fields of this type wanted to check if there's any other approach to solve this issue. — springenthusiast, Oct 04 '17 at 12:12

Bean validation for java.sql.Timestamp

0 Answers0