[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4469) NullPointerException on ManyToMany association at line org.hibernate.type.AbstractType.getHashCode(AbstractType.java:136)
Sachin Mishra (JIRA)
noreply at atlassian.com
Wed Sep 30 23:48:50 EDT 2009
NullPointerException on ManyToMany association at line org.hibernate.type.AbstractType.getHashCode(AbstractType.java:136)
--------------------------------------------------------------------------------------------------------------------------
Key: HHH-4469
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4469
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.3.2
Environment: 2009-10-01 13:27:28,062 INFO [org.hibernate.cfg.annotations.Version] - Hibernate Annotations 3.4.0.GA
2009-10-01 13:27:28,078 INFO [org.hibernate.cfg.Environment] - Hibernate 3.3.2.GA
2009-10-01 13:27:28,078 INFO [org.hibernate.cfg.Environment] - hibernate.properties not found
2009-10-01 13:27:28,078 INFO [org.hibernate.cfg.Environment] - Bytecode provider name : javassist
2009-10-01 13:27:28,078 INFO [org.hibernate.cfg.Environment] - using JDK 1.4 java.sql.Timestamp handling
2009-10-01 13:27:28,141 INFO [org.hibernate.annotations.common.Version] - Hibernate Commons Annotations 3.1.0.GA
2009-10-01 13:27:28,141 INFO [org.hibernate.ejb.Version] - Hibernate EntityManager 3.3.1.GA
Reporter: Sachin Mishra
Attachments: hibernate-log.txt
NullPointer Exception gets thrown on manytomany association when using composite key. Following the example from site http://boris.kirzner.info/blog/archives/2008/07/19/hibernate-annotations-the-many-to-many-association-with-composite-key/
Loading the product entity correctly loads everything as expected but saving new product record doesn't work when using the composite keys.
Item.java
@Entity
@Table(name="item")
public class Item implements Serializable {
private Integer id;
private String name;
private List<ProductItem> productItems = new LinkedList<ProductItem>();
private static Logger logger = Logger.getLogger(Item.class);
/**
* @return the id
*/
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="item_id")
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the productItems
*/
@OneToMany(fetch=FetchType.LAZY,mappedBy="pk.item",cascade={CascadeType.ALL})
@Cascade({org.hibernate.annotations.CascadeType.ALL})
public List<ProductItem> getProductItems() {
return productItems;
}
/**
* @param productItems the productItems to set
*/
public void setProductItems(List<ProductItem> productItems) {
this.productItems = productItems;
}
@Override
public int hashCode() {
int result;
result = (this.id != null ? id.hashCode() : 0);
result = 31 * result + (name != null ? name.hashCode() : 0);
return result;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Item other = (Item) obj;
if (this.id != other.id && (this.id == null || !this.id.equals(other.id))) {
return false;
}
if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
return false;
}
return true;
}
}
Product.java
@Entity
@Table(name="product")
public class Product implements Serializable {
private static Logger logger = Logger.getLogger(Product.class);
private Integer id;
private String name;
private String description;
private double regularPrice;
private List<ProductItem> productItems = new LinkedList<ProductItem>();
/**
* @return the id
*/
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="prod_id")
public Integer getId() {
return id;
}
/**
* @return the name
*/
@Column(name="prod_name")
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the productItems
*/
@OneToMany(fetch=FetchType.LAZY,mappedBy="pk.product",cascade={CascadeType.ALL})
@Cascade({org.hibernate.annotations.CascadeType.ALL})
public List<ProductItem> getProductItems() {
return productItems;
}
/**
* @param productItems the productItems to set
*/
public void setProductItems(List<ProductItem> productItems) {
this.productItems = productItems;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
@Override
public int hashCode() {
int result;
result = (id != null ? id.hashCode() : 0);
result = 31 * result + (name != null ? name.hashCode() : 0);
return result;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Product other = (Product) obj;
if (this.id != other.id && (this.id == null || !this.id.equals(other.id))) {
return false;
}
if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
return false;
}
return true;
}
ProductItem.java
@Entity
@Table(name = "productItem")
@AssociationOverrides({
@AssociationOverride(name = "pk.product", joinColumns = @JoinColumn(name = "product_id")),
@AssociationOverride(name = "pk.item", joinColumns = @JoinColumn(name = "item_id"))
})
public class ProductItem implements Serializable{
private static Logger logger = Logger.getLogger(ProductItem.class);
private ProductItemPk pk ;
/**
* @return the item
*/
@Transient
public Item getItem() {
return getPk().getItem();
}
/**
* @param item the item to set
*/
public void setItem(Item item) {
getPk().setItem(item);
}
/**
* @return the Product
*/
@Transient
public Product getProduct() {
return getPk().getProduct();
}
/**
* @param Product the Product to set
*/
public void setProduct(Product Product) {
getPk().setProduct(Product);
}
/**
* @return the pk
*/
@EmbeddedId
public ProductItemPk getPk() {
return pk;
}
/**
* @param pk the pk to set
*/
public void setPk(ProductItemPk pk) {
this.pk = pk;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ProductItem that = (ProductItem) o;
if (getPk() != null ? !getPk().equals(that.getPk()) : that.getPk() != null) return false;
return true;
}
@Override
public int hashCode() {
return (getPk() != null ? getPk().hashCode() : 0);
}
ProductItemPk.java
@Embeddable
public class ProductItemPk implements Serializable{
private static Logger logger = Logger.getLogger(ProductItemPk.class);
private Item item;
private Product product;
/**
* @return the item
*/
@ManyToOne(optional=false)
public Item getItem() {
return item;
}
/**
* @param item the item to set
*/
public void setItem(Item item) {
this.item = item;
}
/**
* @return the product
*/
@ManyToOne(optional=false)
public Product getProduct() {
return product;
}
/**
* @param product the product to set
*/
public void setProduct(Product product) {
this.product = product;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ProductItemPk that = (ProductItemPk) o;
if (item != null ? !item.equals(that.item) : that.item != null) return false;
if (product != null ? !product.equals(that.product) : that.product != null)
return false;
return true;
}
@Override
public int hashCode() {
logger.error("productitemPK hashcode called");
int result;
result = (item != null ? item.hashCode() : 0);
result = 31 * result + (product != null ? product.hashCode() : 0);
return result;
}
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