Problem saving values from checkboxes

[snah1]

Hello!

I have problems saving values from checkboxes in the database. My jsp page contains several checkboxes (representing values from a static database table). When I choose one or a few checkboxes in my jsp, the values are passed to my SimpleFormController and they should be saved through the onSubmit method as a collection (ArrayList) in a link table. The values in the collection are correct, i.e. the controller gets only the values from the checked checkboxes.

Here is a part of my controller:

public ModelAndView onSubmit(
	            HttpServletRequest request,
	            HttpServletResponse response,
	            Object command,
	            BindException errors)throws Exception
	    {

DailyProductionReport dpr = (DailyProductionReport)command;
List<Employee> employees = new ArrayList<Employee>();

String[] checks = request.getParameterValues("employee");
	 	if(checks!=null){
	 		for (int i = 0; i < checks.length; ++i){
			    int employee_id = Integer.valueOf(checks[i]);
		            System.out.println(employee_id); // employee IDs are those of employees selected
		            Employee employee = em.getEmployee(employee_id); // em - EmployeeManager
		            employees.add(employee); // so I add these employees to the list
		            employee = (Employee)employees.get(i);
		            System.out.println(employee.getSurname()); 
	                   dpr.setEmployees(employees); // and I set the employees list as a property of my parent class DailyProductionReport
	            }
	 	}

                 /*
		  * saving this DPR in the DB
		  */
		 dprManager.addDpr(dpr);
                 return new ModelAndView(getSuccessView());
	    	

	    }

The problem is at dprManager.addDpr(dpr). The inserion is about to begin, but I get here an exception:

Hibernate: insert into DailyProductionReport (date, shift, tidiness, cleanness, dpr_id) values (?, ?, ?, ?, ?)
Hibernate: insert into DailyProductionReport_has_Employee (dpr_id, dprEmployee_id, employee_id) values (?, ?, ?)
12:55:11,640 ERROR DispatcherServlet:406 - Could not complete request
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer

The relationship between DailyProductionReport and Employee is n-m with a link table DailyProductionReport_has_Employee, which should store the selected employees for the specified DailyProductionReport.

What can this excetpion mean in this case?
Why can't the insertion be completed?

snah1

[jwenting]

says it all really. You're passing the store method a String when it expects an integer.
That's what it says, I wonder what's not clear about that?
It's up to you to figure out where you're doing that, but that shouldn't be too hard.