Column definition mapping 'uniqueidentifier '

@Ajinkya Bendre, as per my Understanding You can define String Data Type as uniqueIdentifier as i already have used it earlier, as shown below:-
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@Id
@Column(name="EmployeeID",columnDefinition="VARCHAR(255)")


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But in this case we cannot treat this column to be Auto Generated (i.e. @GeneratedValue), as Integer Type, in Such Cases you need to provide Unique values for that column such as Email ID, Organization Employee ID etc....

Hope this will Help You