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HibernateTools Reverse Engineering tool does not add Annotation for generator
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE
hibernate-reverse-engineering PUBLIC
"-//Hibernate/Hibernate Reverse
Engineering DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-reverse-engineering-3.0.dtd"
<hibernate-reverse-engineering>
  <table-filter match-name="products" match-catalog="test"></table-filter>
  <table catalog="test" name="products">
    <primary-key>
      <generator class="native"></generator>
      <key-column name="product_id"property="product_id" />
    </primary-key>
  </table>
</hibernate-reverse-engineering>

// default package
// Generated Jan 21, 2011 8:27:16 PM by Hibernate Tools 3.3.0.GA

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

/**
 * Products generated by hbm2java
 */
@Entity
@Table(name = "products", catalog = "test")
public class Products implements java.io.Serializable {

 private String productId;
 private String productName;

 public Products() {
 }

 public Products(String productId) {
  this.productId = productId;
 }

 public Products(String productId, String productName) {
  this.productId = productId;
  this.productName = productName;
 }

 @Id
 @Column(name = "product_id", unique = true, nullable = false, length = 50)
 public String getProductId() {
  return this.productId;
 }

 public void setProductId(String productId) {
  this.productId = productId;
 }

 @Column(name = "product_name", length = 200)
 public String getProductName() {
  return this.productName;
 }

 public void setProductName(String productName) {
  this.productName = productName;
 }

}

<key-column name="product_id" property="product_id" />

<key-column name="product_id" property="productId" />