Projecting on an id is giving me inconsistent results. On the same method, sometimes a String is returned, other times a Number. I'm even seeing this difference running the test twice in a row. I haven't been able to find what makes it switch, but I am 100% sure it happens. I have this structure. List<Object[]> result = fts .createFullTextQuery( mj.createQuery(), BaseWallPost.class) .setProjection(ProjectionConstants.ID, "post.id") .list(); for(Object[] tuple : result){ // Long postId = tuple[1] != null? Long.valueOf((String) tuple[1]) : null; Long postId = (Long) tuple[1]; } @Entity public abstract class BaseComment{ @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column @Field(name="longCommentId",index=Index.YES,store=Store.YES,analyze=Analyze.NO) @DocumentId public Long id; } @Entity public abstract class BasePost extends BaseComment{ @ManyToOne @JoinColumn @IndexedEmbedded(includePaths={"id","type","longCommentId"},indexNullAs=Field.DEFAULT_NULL_TOKEN,includeEmbeddedObjectId=true) @ContainedIn//Update the shareCount public Post post; } @Entity public class Post extends BasePost{ } @Entity public class Comment extends BaseComment{ @ManyToOne @JoinColumn @IndexedEmbedded(includePaths={"id","type","blocked","longCommentId"},indexNullAs=Field.DEFAULT_NULL_TOKEN,includeEmbeddedObjectId=true) @ContainedIn public BasePost post; }