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The following example show you how to using System.currentTimeMillis() Java function to assign unique value to entity key which in following class is ( Long id ) .
Code:

package com
.codemiles.jpa;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;


@
Entity
@Table(name="TOPIC")
public class 
topic {
    @
Id
    
private long Id=System.currentTimeMillis();
    private 
String title;
    private 
Date creationDate;
    private 
Date modifedDate;
    private 
String content;
    

    public 
long getId() {
        return 
Id;
    }
    public 
void setId(long id) {
        
Id id;
    }
    
    @
Column(name="TITLE")
    public 
String getTitle() {
        return 
title;
    }
    public 
void setTitle(String title) {
        
this.title title;
    }
    
    @
Column(name="CREATION_DATE")
    public 
Date getCreationDate() {
        return 
creationDate;
    }
    public 
void setCreationDate(Date creationDate) {
        
this.creationDate creationDate;
    }
    
    @
Column(name="MODIFED_DATE")
    public 
Date getModifedDate() {
        return 
modifedDate;
    }
    public 
void setModifedDate(Date modifedDate) {
        
this.modifedDate modifedDate;
    }
    
    @
Column(name="CONTENT")
    public 
String getContent() {
        return 
content;
    }
    public 
void setContent(String content) {
        
this.content content;
    }
}
 




_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


Author:
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