public class PostCommentSummary {

    private Number id;
    private String title;
    private String review;

    public PostCommentSummary(
			Number id, String title, String review) {
        this.id = id;
        this.title = title;
        this.review = review;
    }

    public PostCommentSummary() {}

    public Number getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public String getReview() {
        return review;
    }
}

CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<Object[]> criteria = builder.createQuery(Object[].class);

Root<PostComment> root = criteria.from(PostComment.class);
Join<PostComment, Post> postJoin = root.join("post");

criteria.multiselect(
	root.get(PostComment_.id).alias("id"),
	root.get(PostComment_.review).alias("review"),
	postJoin.get(Post_.title).alias("title")
);

criteria.where(builder.like(postJoin.get(Post_.title), "high-performance%"));

List<PostCommentSummary> comments = entityManager
	.createQuery(criteria)
	.unwrap(Query.class)
	.setResultTransformer(Transformers.aliasToBean(PostCommentSummary.class))
	.getResultList();