Unable to insert data into link table in hibernate many to many - mysql

Question

Relations are like
A project can have many employees.
on a JSP, On selecting a project, all employees are populated.
A text box for task.
Provide a task name for that selected project , select employee(s) for that task and save.
I am able to save task but not in link table.
Entity classes are,
Employee, Task, Project
Employee
#Entity
#Table(name="Employee")
public class Employee implements Serializable{
#Id
#Column(name="employee_id")
private String employeeId;
#Column(name="employee_name")
private String employeeName;
#ManyToMany(mappedBy="employees")
private Set<Task> tasks;
}
Project
#Entity
#Table(name = "Project")
public class Project implements Serializable {
#Id
#Column(name = "project_id")
private int projectId;
#Column(name = "project_name")
private String projectName;
#OneToMany(cascade = CascadeType.ALL)
#JoinTable(name = "PROJECT_EMPLOYEE",
joinColumns = { #JoinColumn(name = "project_id") },
inverseJoinColumns = { #JoinColumn(name = "employee_id") })
private Set<Employee> employees;
}
Task
#Entity
#Table(name = "Task")
public class Task implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "task_id")
private int taskId;
#Column(name = "task_details")
private String taskDetails;
#Temporal(TemporalType.DATE)
#Column(name = "start_date")
private Date startDate;
#Temporal(TemporalType.DATE)
#Column(name = "end_date")
private Date endDate;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "project_id", nullable = false)
private Project project;
#ManyToMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinTable(name = "Task_Employee", joinColumns = { #JoinColumn(name = "task_id") }, inverseJoinColumns = {
#JoinColumn(name = "employee_id") })
#Embedded
private Set<Employee> employees;
}
Not able to save into Task_Employee table.
Dao code:
From jsp, I am getting all string values and creating task object like this, empView is the view object getting from JSP page and creating Task object to save in dao.
Set<Employee> empSet = new HashSet<Employee>();
for(String employeeId : empView.getEmployees()) {
Employee emp = new Employee();
emp.setEmployeeId(employeeId);
//emp.setEmployeeName("aaa");
//emp.setProject(new Project(empView.getProjectId()));
empSet.add(emp);
}
return new Task(0, empView.getTaskDesc(), new Project(empView.getProjectId()), toDate(empView.getStartDate()),
toDate(empView.getEndDate()), empSet);
Save the above returned task object.
sessionFactory.openSession().save(task);
Thanks