Hi, we had the same issue with mappedby and IndexColumn.

We could solve it by using @JoinColumn in both classes.

So in class Document we had:

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, 
mappedby="document")
    @BatchSize(size = 10)
    @IndexColumn(name="indexInDocument")
    public List getMessages() {
        return messages;
    }


and in Message object:
@ManyToOne
public Document getDocument() {
                return document;
        }

for @IndexColumn to work I changed annotations:
    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name="document_id")
    @IndexColumn(name="indexInDocument")
    public List getMessages() {
        return messages;
    }


        @ManyToOne
        @JoinColumn(name="documentid",insertable=false,updatable=false)
        public Document getDocument() {
                return document;
        }


And after that indexing worked.

For detailed explanation of that case see hibernate annotations documentation: 
http://www.hibernate.org/hib_docs/annotations/reference/en/html_single/
part 2.2.5.3.2.1. Bidirectional


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