@Entity
@Table(name="roles")
public class Role
{
   @Id
   @GeneratedValue
   @Column(name="ROLE_ID")
   private Long id;
   @OneToMany(
         fetch=FetchType.LAZY,
         cascade={CascadeType.PERSIST,CascadeType.MERGE,CascadeType.REMOVE},
         mappedBy="role"
   )
   private List<RoleFunctionAccess> roleFunctionAccess;
        // other stuff
};   

@Entity
@Table(name="role_function_access")
public class RoleFunctionAccess
{
   @SuppressWarnings("serial")
   @Embeddable
   public static class Id implements Serializable
   {
      // Composite Id Variables
      @Column(name = "ROLE_ID")
      private Long roleId;
      
      @Column(name = "FUNCTION_ID")
      private Long functionId;
                // other stuff
         }   
   // Variables
   @EmbeddedId
   private Id id = new Id();
   
   @Column(name = "ACCESS_FLAGS")
   private Long accessFlags;
   
   @ManyToOne
   @JoinColumn(name="ROLE_ID",insertable=false,updatable=false)
   private Role role;
   // other stuff
};