Scope of java class used for building data control

Question

Hello,
I have tried a sample application where in we are using Datacontrols to render the UI.
The data control is generated off a simple java class(abc.java) which is used to render a "Page called - Employee". This java class then uses a session bean which in turn talks with the database entities. The database entities(POJO's - employee.java) are then exposed in the abc.java and used to display data on the UI such as employee name, id , etc.
My question is regarding the scope of abc.java. I presume, that the constructor of this class will be called when the page is rendered.
Now say i am navigating from some Page-A to Page-Employee. On click of a button in Page A, i want to go to the Database, retrieve a particular employee's details and then place it in the employee entity exposed in abc.java so that it gets displayed when Page-Employee is rendered.
If the actionlistener method of the button click in Page A has the code of - 1)create new instance of abc - new abc() 2)retrieve employee entity 3) set employee entity in the class level attribute of abc
But on going to the next page-employee, a new instance of abc is getting created and i am losing the employee that i had retrieved in the previous screen.
Is there a scope for abc that can be set somewhere similar to managed beans? or is there some other solution.
-thanks

Answer 1

Hi,
Say, on an 'employee create page' we use data controls which are generated from a java class, 'EmployeeService'.
This java class has the POJO(entity) - Employee whose attributes like name, description are used to create input text boxes on the employee page.
Now, assume we come to the Employee create page from some other page in the application; where exactly is the best place to make an instance of the employee entity.
Do we place- Employee emp = new Employee(); in the constructor of the EmployeeService.java class or is there some other way?
Any pointers would help.
Thanks
Edited by: user9935204 on Feb 4, 2010 8:44 PM