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Example of @NotFound in Hibernate

By Arvind Rai, May 30, 2013
@NotFound in hibernate is used when entities are associated to each other by ManyToOne, OneToMany etc. Suppose joined subclass has no data related to any id due to some database inconsistency. And we do not want to throw error, in this case @NotFound helps us. If we use @NotFound, then for any id if there is no data in associated joined subclass, error will not be thrown. @NotFound has two action NotFoundAction.IGNORE and NotFoundAction.EXCEPTION. Find the code snippet.

State.java
@Entity
@Table(name = "state")
public class State {
	@Id
	@Column(name = "id")
	private int id;

	@Column(name = "name")
	private String name;
	
	@ManyToOne
	@NotFound(action=NotFoundAction.IGNORE)
	private Country country;
}
 


Country.java
@Entity
public class Country implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
	@Column(name="id")
	private int id;
	
	@Column(name="name")
	private String name;
	
	@OneToMany(cascade=CascadeType.ALL)
	@JoinColumn(name="country_id")
	private Set<State> states;
}
 
POSTED BY
ARVIND RAI
ARVIND RAI
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