Sending more than one class

Question

Hi guys,
In my application each table has a corresponding Serializable class javabeans style, fine-grained. If a table has a foreign key then it is refered to as a seperate class. For example:
CREATE TABLE location (location_id int, location_name varchar(50))
CREATE TABLE employee
(employee_id int, location_id int)
public class Location implements java.io.Serializable {
  int locationId;
  String locationName;
public class Employee implements java.io.Serializable {
  int employeeId;
  Location location;
}My DAOs retrieve data and populate the above class with it and then return it. The DAOs also resolved other classes references. So a DAO metohd getEmployeeById( int employeeId ) will return an Employee class object whose location is also being populated.
In a typical case, a JSP page request a Stateless Session Bean EJB which uses DAOs to retrieve data, put it in the corresponding class and then send it to JSP which process it and show it to user.
So basically these classes (are they called domain classes?) are being used to trasfer data so I can call them DTOs or VOs.
But some times I need to send a combination of classes data to JSP i.e., data comprised of more than one such class. What is the best way to manage this problem?
Thanks

Answer 1

Employee-Location was an example just to show how I am programming.
To show the problem I am having, here is a scenario:
I have 2 tables "task" and "job" for which I have created classes "Task" and "Job" respectively. Eash of these tables has foreign keys which are of no concern here (My DAOs when retrieve data do populate them properly).
public class Task implements java.io.Serializable {
  int taskId;
  String taskName;
public class Job implements java.io.Serializable {
  int jobId;
  String jobName;
}Now there is many-to-many relationship between these 2 tables and it is "taskjob" table (a foreign key to task table; another foreign key to job table). So I created a TaskJob class:
public class TaskJob implements java.io.Serializable {
  int taskJobId;
  Task task;
  Job job;
}In one JSP, user selects a Task and click OK. Then on the next page I need to list all Jobs defined in the System as checkboxes. The jobs which are linked to the Task selected will be shown as checked while other jobs will be shown as unchecked.
In this scenario the JSP needs data from both Job and TaskJob class. MY question is how to manage it cleanly?