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If you want to specify that a column can't take no value ( null ) ,you will need to add (nullable=false) attribute in the @Column annotation.

Code:

package com
.codemiles.jpa;

import java.util.Date;

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

@
Entity
@Table(name="BED")
public class Bed implements java.io.Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    private String Id
;
    private String type;
    private Date production_date;
    private String width;
    private String height;
    @OneToOne
    
@PrimaryKeyJoinColumn
    private Person person
;
    public String getId() {
        return Id;
    }
    public void setId(String id) {
        Id = id;
    }
     
    
@Column(name="TYPE" ,nullable=false)
    public String getType() {
        return type;
    }
    
    public void setType
(String type) {
        this.type = type;
    }
    @Column(name="PRODUCTION")
    public Date getProduction_date() {
        return production_date;
    }
    public void setProduction_date(Date production_date) {
        this.production_date = production_date;
    }
    @Column(name="WIDTH")
    public String getWidth() {
        return width;
    }
    public void setWidth(String width) {
        this.width = width;
    }
    @Column(name="HEIGHT")
    public String getHeight() {
        return height;
    }
    public void setHeight(String height) {
        this.height = height;
    }
    public void setPerson(Person person) {
    this.person = person;
    }
    public Person getPerson() {
    return person;
    }
    
    
}
 




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


Author:
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