#ManyToOne seems not working as i expect it to be - jpa

Question

I'm working with many-to-one relationship between my two tables(Employee and Department) in which any Employee can work in more than one department. I used the #ManyToOne annotation on the Department object field which I created in Employee entity class. Now when I persist the Employee entity with a particular department, it works fine but when I try to persist another Employee entity with the same department, it creates a new Department entity with the same name and persists it with different id. What I expect it to do is that when I persist an Employee entity with already persisted department, it should just update the foriegn key of the Employee entity to point the id of that department. Sorry if I didnt got the many-to-one concept totally.
EMPLOYEE entity
package com.test.domain;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.TableGenerator;
#Entity
public class Employee {
#TableGenerator(name="Empl_Gen", table="ID_GEN",pkColumnName="GEN_NAME",valueColumnName="GEN_VALUE", initialValue=0, allocationSize=1)
#Id#GeneratedValue(generator="Empl_Gen",strategy=GenerationType.TABLE)
private Long id;
private String Name;
private String Country;
#ManyToOne(cascade=CascadeType.ALL)
#JoinColumn(name="DEPT_ID")
private Department department;
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getCountry() {
return Country;
}
public void setCountry(String country) {
Country = country;
}
}
DEPARTMENT entity
package com.test.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.TableGenerator;
#Entity
public class Department {
#TableGenerator(name="DEP_GEN",table="ID_GEN",pkColumnName="GEN_NAME",valueColumnName="GEN_VALUE", pkColumnValue="DEP_GEN",initialValue=0,allocationSize=1)
#Id#GeneratedValue(strategy=GenerationType.TABLE,generator="DEP_GEN")
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package com.test.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.test.domain.Employee;
import com.test.service.EmployeeService;
/**
* Handles requests for the application home page.
*/
#Controller
#RequestMapping("/addEmployee")
public class HomeController {
#Autowired
EmployeeService service;
#RequestMapping(method=RequestMethod.GET)
public String getform(Model model)
{
model.addAttribute("employee",new Employee());
return "home";
}
#RequestMapping(method=RequestMethod.POST)
public String setform(Employee employee)
{
service.save(employee);
return"success";
}
}
package com.test.dao;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.test.domain.Employee;
#Repository
#Transactional
public class Employeedaoimpl implements Employeedao
{
#PersistenceContext
EntityManager manager;
#Override
public void save(Employee employee) {
manager.persist(employee);
}
}

Answer 1

Try this:
#TableGenerator(name="DEP_GEN",table="ID_GEN",pkColumnName="GEN_NAME",valueColumnName="GEN_VALUE", pkColumnValue="DEP_GEN",initialValue=0,allocationSize=1)
#Id#GeneratedValue(strategy=GenerationType.TABLE,generator="DEP_GEN")
#Column(name = "DEPT_ID")
private Long id;