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Hendy Irawan edited a comment on an issue

BTW in JPA 2.1 / upcoming Hibernate 4.3 {{@ javax.persistence. JoinTable}} can contain {{indexes}}, this may do what you want.

It surely does mine (but I'm mapping a {{Set}} of values to a table, so it's one-to-many, not many-to-many).

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Hibernate ORM /

HHH-4263

I have trouble adding an index to a column of a table which is part of a many-to-many property mapping. The following example causes a NullPointerException when generating the DDL (the exception can be seen at the end of my post):

@Entity @Table(name="usr")
public class User implements Serializable
{
@Id @GeneratedValue(strategy=GenerationType.AUTO)
...

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