如何在eclipse中为数据库创建实体类

Question

“数据库中的实体类”在Netbeans中受支持但是在eclipse Indigo中我尝试了很多，但除了JPA的实体类之外没有找到任何方法，我想为动态web项目（struts2）为hibernate创建实体类

Netbeans可以像这样创建但是为什么eclipse不能以这种方式创建“来自数据库的实体类”

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package temp;

import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author Shakeel
 */
@Entity
@Table(name = "email")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Email.findAll", query = "SELECT e FROM Email e"),
    @NamedQuery(name = "Email.findByEmailId", query = "SELECT e FROM Email e WHERE e.emailId = :emailId"),
    @NamedQuery(name = "Email.findByUserId", query = "SELECT e FROM Email e WHERE e.userId = :userId"),
    @NamedQuery(name = "Email.findByEmailAddress", query = "SELECT e FROM Email e WHERE e.emailAddress = :emailAddress")})
public class Email implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "email_id")
    private Integer emailId;
    @Column(name = "user_id")
    private Integer userId;
    @Column(name = "email_address")
    private String emailAddress;

    public Email() {
    }

   //all gatter and setter

}