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POJPA persist many to many
 

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    <p>I have a pretty standard scenario whereby I have a table of Users with user_id as the PK and a table of Roles with role_id as the PK. The two tables are related via a many to many relationship (ie. Users can have many roles and a role can be applied to many users) and subsequently I have a joining table called users_has_roles. The only two columns in users_has_roles are users_user_id and roles_role_id.</p> <p>I have generated the entity classes (see below) and I have no problem persisting data to the users and roles tables but I have failed miserably persist anything to the users_has_roles joining table so currently none of my users are being assigned a role. Before I go crazy could somebody put me out of my misery and show me how I should go about adding a users_user_id with a corresponding roles_role_id to the users_has_roles table so my users can have roles?</p> <p>My Users.java entity class:</p> <pre><code>@Entity @Table(name = "users") @XmlRootElement @NamedQueries({ @NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"), @NamedQuery(name = "Users.findByUserId", query = "SELECT u FROM Users u WHERE u.userId = :userId"), @NamedQuery(name = "Users.findByUsername", query = "SELECT u FROM Users u WHERE u.username = :username"), @NamedQuery(name = "Users.findByPassword", query = "SELECT u FROM Users u WHERE u.password = :password")}) public class Users implements Serializable { private static final long serialVersionUID = 1L; @Id @Basic(optional = false) @NotNull @Size(min = 1, max = 60) @Column(name = "user_id") private String userId; @Basic(optional = false) @NotNull @Pattern(regexp="[a-z0-9!#$%&amp;'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&amp;'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="Invalid email") @Size(min = 1, max = 45) @Column(name = "username") private String username; @Basic(optional = false) @NotNull @Size(min = 1, max = 120) @Column(name = "password") private String password; @JoinTable(name = "users_has_roles", joinColumns = { @JoinColumn(name = "users_user_id", referencedColumnName = "user_id")}, inverseJoinColumns = { @JoinColumn(name = "roles_role_id", referencedColumnName = "role_id")}) @ManyToMany private Collection&lt;Roles&gt; rolesCollection; @OneToMany(cascade = CascadeType.ALL, mappedBy = "usersUserId") private Collection&lt;UserAccount&gt; userAccountCollection; @OneToMany(cascade = CascadeType.ALL, mappedBy = "usersUserId") private Collection&lt;UserDetails&gt; userDetailsCollection; ... All the getter and setter methods etc. </code></pre> <p>My Roles.java entity class:</p> <pre><code>@Entity @Table(name = "roles") @XmlRootElement @NamedQueries({ @NamedQuery(name = "Roles.findAll", query = "SELECT r FROM Roles r"), @NamedQuery(name = "Roles.findByRoleId", query = "SELECT r FROM Roles r WHERE r.roleId = :roleId"), @NamedQuery(name = "Roles.findByRoleName", query = "SELECT r FROM Roles r WHERE r.roleName = :roleName"), @NamedQuery(name = "Roles.findByRolePermission", query = "SELECT r FROM Roles r WHERE r.rolePermission = :rolePermission"), @NamedQuery(name = "Roles.findByRoleDescription", query = "SELECT r FROM Roles r WHERE r.roleDescription = :roleDescription")}) public class Roles implements Serializable { private static final long serialVersionUID = 1L; @Id @Basic(optional = false) @NotNull @Size(min = 1, max = 60) @Column(name = "role_id") private String roleId; @Basic(optional = false) @NotNull @Size(min = 1, max = 45) @Column(name = "role_name") private String roleName; @Basic(optional = false) @NotNull @Size(min = 1, max = 45) @Column(name = "role_permission") private String rolePermission; @Size(max = 45) @Column(name = "role_description") private String roleDescription; @ManyToMany(mappedBy = "rolesCollection") private Collection&lt;Users&gt; usersCollection; ... All the getter and setter methods etc. </code></pre> <p>Thanks</p> <p>---- UPDATE ----</p> <pre><code>// New Users Users currentUser = new Users(); currentUser.setUserId(userId); currentUser.setUsername(email); currentUser.setPassword(password); getUsersFacade().create(currentUser); </code></pre>
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