createalias in hibernate is joining parent table two times - spring

Question

I have bidirectional one to many between department and employees.ie one department can have multiple employees.
I want to join department and employees using hibernate criteria so for that i am using createalias method.
Criteria criteriaDepartment = session.createCriteria(DepartmentEntity.class);
criteriaDepartment.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY);
criteriaDepartment.createAlias("employeeEntity", "emp",JoinType.LEFT_OUTER_JOIN);
List<DepartmentEntity> list = criteriaDepartment.list();
However, hibernate joins department table with employees and then again with the department table.
Query generated by hibernate is as follows:
Hibernate: select this_.id as id1_1_2_, this_.name as name2_1_2_, emp1_.deptId as deptId7_2_4_, emp1_.id as id1_2_4_, emp1_.id as id1_2_0_, emp1_.address as address2_2_0_, emp1_.deptId as deptId7_2_0_, emp1_.password as password3_2_0_, emp1_.phoneno as phoneno4_2_0_, emp1_.type as type5_2_0_, emp1_.userid as userid6_2_0_, department4_.id as id1_1_1_, department4_.name as name2_1_1_ from Department4 this_ left outer join Userdetails4 emp1_ on this_.id=emp1_.deptId left outer join Department4 department4_ on emp1_.deptId=department4_.id
Why Department table is joining multiple times??? Is there any way to prevent this. I have to use some restrictions as well.
However when i use fetchmode it works fine but with this method i am not able to use aliases.
Department class:
#Entity
#Table(name = "Department4")
public class DepartmentEntity {
#Id
#GeneratedValue(strategy=GenerationType.SEQUENCE)
public int id;
public String name;
#OneToMany(mappedBy= "departmentEntity", cascade= CascadeType.ALL, orphanRemoval = true)
public Set<EmployeeEntity> employeeEntity = new HashSet<EmployeeEntity>();
public Set<EmployeeEntity> getEmployeeEntity() {
return employeeEntity;
}
public void setEmployeeEntity(Set<EmployeeEntity> employeeEntity) {
this.employeeEntity = employeeEntity;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Override
public String toString() {
return "DepartmentEntity [id=" + id + ", name=" + name + ", employeeEntity=" + employeeEntity + "]";
}
}
Employee class
#Entity
#Table(name="Userdetails4")
public class EmployeeEntity {
#Id
#GeneratedValue(strategy=GenerationType.SEQUENCE)
private int id;
private String userid;
private String password;
private String address;
private long phoneno;
private String type;
#ManyToOne
#JoinColumn(name = "deptId")
private DepartmentEntity departmentEntity;
#OneToMany(mappedBy = "employeeEntity", cascade = CascadeType.ALL, orphanRemoval = true)
private Set<AddressEntity> addressEntity = new HashSet<AddressEntity>();
public Set<AddressEntity> getAddressEntity() {
return addressEntity;
}
public void setAddressEntity(Set<AddressEntity> addressEntity) {
this.addressEntity = addressEntity;
}
public DepartmentEntity getDepartmentEntity() {
return departmentEntity;
}
public void setDepartmentEntity(DepartmentEntity departmentEntity) {
this.departmentEntity = departmentEntity;
}
public EmployeeEntity()
{}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public long getPhoneno() {
return phoneno;
}
public void setPhoneno(long phoneno) {
this.phoneno = phoneno;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
#Override
public String toString() {
return "EmployeeEntity [id=" + id + ", userid=" + userid + ", password=" + password + ", address=" + address
+ ", phoneno=" + phoneno + ", type=" + type + "]";
}
}
Hibernate version: 5.2.1
Thanks in advance.