[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3410) @OneToMany forces unique key in @JoinTable when inverseJoinColumns = @JoinColumn(unique=false)

@OneToMany forces unique key in @JoinTable when inverseJoinColumns = @JoinColumn(unique=false) ---------------------------------------------------------------------------------------------- Key: HHH-3410 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3410 Project: Hibernate Core Issue Type: Bug Affects Versions: 3.2.6 Environment: MySQL 5.0.51b, Hibernate Core 3.2.6 GA, Hibernate Annotations 3.3.1 GA Reporter: Kamil Morong Hi, I need to have this class composition with one to many relation: @Entity @Table(name="USER") public class User implements java.io.Serializable { private Long id; private String username; private String password; private Set<Role> roles = new LinkedHashSet<Role>(); public User() { } @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "USER_ID") public Long getId() { return id; } public void setId(Long id) { this.id = id; } @Column(name="USERNAME", nullable=false, unique=true) public String getUsername() { return username; } public void setUsername(String userName) { this.username = userName; } @Column(name="PASSWORD", nullable=false) public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @CollectionOfElements @OneToMany(cascade={CascadeType.PERSIST, CascadeType.MERGE}) @JoinTable(name = "USER_ROLE", joinColumns = @JoinColumn(name = "USER_ID", unique=false), inverseJoinColumns = @JoinColumn(name = "ROLE_ID", unique=false)) @Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE) @LazyCollection(LazyCollectionOption.FALSE) public Set<Role> getRoles() { return roles; } public void setRoles(Set<Role> roles) { this.roles = roles; } } @Entity @Table(name="ROLE") public class Role implements java.io.Serializable { private Long id; private String name; public Role() { } @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "ROLE_ID") public Long getId() { return id; } public void setId(Long id) { this.id = id; } @Column(name="NAME", nullable=false, unique=true) public String getName() { return name; } public void setName(String name) { this.name = name; } } This will create db tables like SQL script CREATE TABLE `user` ( `USER_ID` BIGINT(20) NOT NULL AUTO_INCREMENT, `PASSWORD` VARCHAR(255) NOT NULL DEFAULT '', `USERNAME` VARCHAR(255) NOT NULL DEFAULT '', PRIMARY KEY (`USER_ID`), UNIQUE KEY `USERNAME` (`USERNAME`) ); CREATE TABLE `role` ( `ROLE_ID` BIGINT(20) NOT NULL AUTO_INCREMENT, `NAME` VARCHAR(255) NOT NULL DEFAULT '', PRIMARY KEY (`ROLE_ID`), UNIQUE KEY `NAME` (`NAME`) ); CREATE TABLE `user_role` ( `USER_ID` BIGINT(20) NOT NULL, `ROLE_ID` BIGINT(20) NOT NULL, PRIMARY KEY (`USER_ID`, `ROLE_ID`), UNIQUE KEY `ROLE_ID` (`ROLE_ID`), KEY `FKBC16F46A1174FFAB` (`ROLE_ID`), KEY `FKBC16F46AB69FC38B` (`USER_ID`), CONSTRAINT `FKBC16F46AB69FC38B` FOREIGN KEY (`USER_ID`) REFERENCES `user` (`USER_ID`), CONSTRAINT `FKBC16F46A1174FFAB` FOREIGN KEY (`ROLE_ID`) REFERENCES `role` (`ROLE_ID`) ); Tables USER and ROLE are right, but the join table USER_ROLE still have defined UNIQUE KEY `ROLE_ID` (`ROLE_ID`). This causes there cannot be one user with many roles. There must be some bug while generating database scheme. I am not able to remove unique key.