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import javax.persistence.Column;
import javax.persistence.Embeddable;

@Embeddable
public class ItemId implements Serializable {
	
	@Column(columnDefinition="char(7)")
	private String	itemtype;
	private int		itemno;
	
    public ItemId() {

    }
	
    public ItemId(String itemtype, int itemno) {
        this.itemtype = itemtype;
        this.itemno = itemno;
    }
	
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = itemtype.hashCode() + itemno;
		return result;
	}
 
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		ItemId other = (ItemId) obj;
		if (itemtype == null) {
			if (other.itemtype != null)
				return false;
		} else if (!itemtype.equals(other.itemtype))
			return false;
		if (itemno != other.itemno)
			return false;
		return true;
	}
	
	public String getItemtype() {
		return itemtype;
	}
	public void setItemtype(String itemtype) {
		this.itemtype = itemtype;
	}
	public int getItemno() {
		return itemno;
	}
	public void setItemno(int itemno) {
		this.itemno = itemno;
	}

}

import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.ManyToOne;
import javax.persistence.MapsId;

@Entity
public class ItemInfo {
	
	@EmbeddedId 
	ItemId itemid;
	
	@Column(nullable=false,insertable = false,updatable=false) 
	private String	itemtype;
	
	@Column(nullable=false,insertable = false,updatable=false) 
	private int		itemno;
	
	String itemname;
	
    @MapsId("idstaticid") //references EmbeddedId's property
    @JoinColumns({
        @JoinColumn( insertable = false, updatable = false,
            name = "itemtype",
            referencedColumnName = "itemtype"),
        @JoinColumn( insertable = false, updatable = false,
            name = "itemno",
            referencedColumnName = "itemno")
    })
    @ManyToOne
    private ItemStatics statics;
	


}