Using a ``++type="timestamp"++`` column as the primary key of a table is slightly risky. Two threads could create new objects in the table close enough in sequence for them to both have the same timestamp. Alternately, this could happen during a daylight savings time change. Instead, use a numeric value as the ``++@Id++``.


This rule raises an issue when a time or date-related class is annotated with ``++@Id++``.

== Noncompliant Code Example

----
public class Person {

  @Id
  @Type(type="timestamp")
  private Date birthDate;  // Noncompliant

  private String lastName;  
  // ...
}
----

== Compliant Solution

----
public class Person {

  @Id
  @GeneratedValue
  int id;

  @Type(type="timestamp")
  private Date birthDate;

  private String lastName;  
  // ...
}
----