#Id Not Mapped For Specific Entity In A Spring-Boot Controller - spring-boot

Question

I have two entities Employee and Department and each have a Spring Web #RestController annotated class with update methods i.e. Http PUT.
For some strange reason (and likely a blindingly obvious solution) whenever the PUT is called for the Employee class, the ID in the JSON payload is NOT mapped to the id class of the Employee entity but it works perfectly for the Department entity.
Employee class:
Entity
#Table(name = "EMPLOYEE")
public class Employee implements Serializable, Identity<Long>, Deleted
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "NAME")
private String name;
#ManyToOne
#Where(clause = "is_deleted = false")
private Department department;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "EMP_QUAL", joinColumns = #JoinColumn(name = "EMPLOYEE_ID"), inverseJoinColumns = #JoinColumn(name = "QUALIFICATION_ID"))
#WhereJoinTable(clause = "IS_DELETED = false")
#SQLDelete(sql = "UPDATE `EMP_QUAL` SET IS_DELETED = true where EMPLOYEE_ID = ? and QUALIFICATION_ID = ? and IS_DELETED = False")
private Set<Qualification> qualifications;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "EMP_PROJ", joinColumns = #JoinColumn(name = "emp_id"), inverseJoinColumns = #JoinColumn(name = "proj_id"))
#Where(clause = "is_deleted = false")
private Set<Project> projects;
#JsonIgnore
#Column(name = "is_deleted", nullable = false)
private Boolean isDeleted = false;
#Override
public Long getId()
{
return this.id;
}
#Override
public void setId(final Long id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(final String name)
{
this.name = name;
}
public Set<Project> getProjects()
{
return projects;
}
public void setProjects(final Set<Project> projects)
{
this.projects = projects;
}
public Department getDepartment()
{
return department;
}
public void setDepartment(final Department department)
{
this.department = department;
}
public Set<Qualification> getQualifications()
{
return qualifications;
}
public void setQualifications(final Set<Qualification> qualifications)
{
this.qualifications = qualifications;
}
public Boolean isDeleted()
{
return isDeleted;
}
public void setDeleted(final Boolean deleted)
{
isDeleted = deleted;
}
}
Department class:
#Entity
#Table(name = "DEPARTMENT")
public class Department implements Serializable, Identity<Long>, Deleted
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
private String name;
#OneToMany(fetch = FetchType.EAGER)
#WhereJoinTable(clause = "is_deleted = false")
#JoinTable(name = "DEPARTMENT_EMPLOYEE", joinColumns = {#JoinColumn(name = "department_id")},
inverseJoinColumns = {#JoinColumn(name = "employee_id")})
#SQLDelete(sql = "UPDATE DEPARTMENT_EMPLOYEE SET is_deleted = true where department_id = ? and employee_id = ? and is_deleted = false")
private Set<Employee> departmentMembers;
#Column(name = "is_deleted", nullable = false)
private Boolean isDeleted;
#Override
public Long getId()
{
return this.id;
}
#Override
public void setId(final Long id)
{
this.id = id;
}
#Override
public Boolean isDeleted()
{
return this.isDeleted;
}
#Override
public void setDeleted(final Boolean isDeleted)
{
this.isDeleted = isDeleted;
}
public String getName()
{
return name;
}
public void setName(final String name)
{
this.name = name;
}
public Set<Employee> getDepartmentMembers()
{
return departmentMembers;
}
public void setDepartmentMembers(final Set<Employee> departmentMembers)
{
this.departmentMembers = departmentMembers;
}
}
When call PUT /employees/{id}:
Calling PUT /departments/{id}:
As you can see in the screenshots of the debugger the id field of Department is populated while it is null in Employee. I'm testing this with Swagger and I am setting the ID in the payload. I don't have any specific Jackson configuration set I just use Spring boot's default but I cannot work out why only in Employee the id field is never mapped.
Employee body:
{
"id":1,
"name": "New Name"
}
Department body:
{
"id":2,
"name": "chemistry",
"deleted":false
}

Answer 1

The issue was due to a Jackson annotation #JsonIdentityInfo on another entity Project which is has a relationship with Employee:
#Entity
#Table(name = "PROJECT")
public class Project implements Serializable, Identity<Long>, Deleted
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
private String name;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "EMP_PROJ", joinColumns = #JoinColumn(name = "proj_id"), inverseJoinColumns = #JoinColumn(name = "emp_id"))
#JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "id")
#Where(clause = "is_deleted = false")
private Set<Employee> employees;