How to execute delete statements with jpa query

Use the executeUpdate method of the Query interface. It will return the number of deleted entries:

public int deleteOldMessages(int daysBack) {
  var query = em.createQuery("delete from Message m where createdAt < :givenTimestamp");
  query.setParameter(Message.GIVEN_TIMESTAMP, LocalDateTime.now().minusDays(daysBack));

  return query.executeUpdate();
}

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