java - how to orderBy string date? CriteriaBuilder -

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how can orderby string date correctly(in date format) using criteria builder? because stored date in model string.

my model:

@column(name = "date_time")

private string datetime;

when try query it.

    criteriabuilder cb = jpa.em().getcriteriabuilder();     criteriaquery<t> cq = cb.createquery(pickup.class);     root<t> root = cq.from(pickup.class);     criteriaquery<t> = cq.select(root);      cq.orderby(cb.desc(root.get("datetime")));

i got wrong order, how can make string date date format orderby it? i'm new it, can me? in advance. 

datetimeformatter datetimeformatter = datetimeformat.forpattern("yourpattern"); criteriabuilder cb = jpa.em().getcriteriabuilder(); criteriaquery<t> cq = cb.createquery(pickup.class); root<t> root = cq.from(pickup.class); criteriaquery<t> = cq.select(root); cq.orderby(cb.desc(datetimeformatter.parsedatetime(root.get("datetime"))));

you can convert datetimestring datetime datetimeformatter.


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