JPA and criteria API - select only specific columns - JPA & criteria API - select only specific columns

problem ：

I would like to select only specific columns (ex. SELECT a FROM b ). I want to select only specific columns （ for example SELECT a FROM b ）.I have a generic DAO and what I came up with is: I have a general DAO, What I came up with was ：

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 not applicable for the arguments (Path<Object>) . The error is ： The method select(Selection<? extends T>) in the type CriteriaQuery<T> is not applicable for the arguments (Path<Object>) .How should I change that? How can I change ？I want to get a type T object that has only ID and VERSION fields, and all others are null . I want to get one only ID and VERSION Field T object , All other objects are null .

Type T extends AbstractEntity which has those 2 fields. type T Expand AbstractEntity , It has these two fields .

entityClazz is T.class .entityClazz yes T.class .

---

Solution ：

Reference resources ： https://stackoom.com/en/question/qwe1