criteria-api

I need to create a "real" dynamic JPA CriteriaBuilder . I get an Map<String, String> with the statements. It looks like: name : John surname : Smith email : email@email.de ...more pairs possible Here is what i implement: CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<User> query = cb.createQuery(User.class); Root<User> userRoot = query.from(User.class); query.select(userRoot); List<Predicate> predicates = new ArrayList<Predicate>(); Iterator<String> column = statements.keySet().iterator(); while (column.hasNext()) { // get the pairs String colIndex = column.next(); String colValue

I would like to select only specific columns (ex. SELECT a FROM b ). I have a generic DAO and what I came up with is: public List<T> getAll(boolean idAndVersionOnly) { CriteriaBuilder builder = manager.getCriteriaBuilder(); CriteriaQuery<T> criteria = builder.createQuery(entityClazz); Root<T> root = criteria.from(entityClazz); if (idAndVersionOnly) { criteria.select(root.get("ID").get("VERSION")); // HERE IS ERROR } else { criteria.select(root); } return manager.createQuery(criteria).getResultList(); } And the error is: The method select(Selection<? extends T>) in the type CriteriaQuery<T> is

I would like to use JPA2 Criteria API with metamodel objects, which seems to be pretty easy: ... Root<JPAAlbum> albm = cq.from(JPAAlbum.class); ... albm.get(JPAAlbum_.theme) ... ; but this Root.get always throws a NullPointerException . JPAAlbum_.theme was automatically generated by Hibernate and looks like public static volatile SingularAttribute<JPAAlbum, JPATheme> theme; but it's obviously never populated. Am I missing a step in the initialization of the framework ? EDIT: here is a snippet of how I use JPA and the metamodel when it's crashing: CriteriaBuilder cb = em.getCriteriaBuilder();

Can you please help me how to convert the following codes to using "in" operator of criteria builder? I need to filter by using list/array of usernames using "in". I also tried to search using JPA CriteriaBuilder - "in" method but cannot find good result. So I would really appreciate also if you can give me reference URLs for this topic. Thanks. Here is my codes: //usersList is a list of User that I need to put inside IN operator CriteriaBuilder builder = getJpaTemplate().getEntityManagerFactory().getCriteriaBuilder(); CriteriaQuery<ScheduleRequest> criteria = builder.createQuery