org.hibernate.AnnotationException: No identifier specified for entity
Posted: 10 May 2012 04:53 AM PDT
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When you are writing a piece of code from scratch a lot of time you do silly mistakes and still wonder why its not working. Well same thing happened the other day when I added a Hibernate Entity class in one project and was struggling to make it work.
The exception was:
org.hibernate.AnnotationException: No identifier specified for entity: net.viralpatel.hibernate.Employee
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:650)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1112)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1269)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:150)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:888)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:416)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:126)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:227)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:273)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1367)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1333)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:471)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
The error here is that in your Entity class, you have not defined a primary key. Thus specify either
@Id annotation or an @EmbeddedId annotation.
So if you have an entity class Employee like below:
package net.viralpatel.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;
@Entity
@Table(name="EMPLOYEE")
public class Employee {
@Column(name="employee_id")
private Long employeeId;
@Column(name="firstname")
private String firstname;
@Column(name="lastname")
private String lastname;
//Getter and Setter methods
}And if you try to execute this, it will generate exception org.hibernate.AnnotationException: No identifier specified for entity: net.viralpatel.hibernate.Employee
So the solution is just add @Id to appropriate primary key column.
package net.viralpatel.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Id;
@Entity
@Table(name="EMPLOYEE")
public class Employee {
@Id
@Column(name="employee_id")
private Long employeeId;
@Column(name="firstname")
private String firstname;
@Column(name="lastname")
private String lastname;
//Getter and Setter methods
}Thus every class defined as Entity with @Entity annotation, needs an @Id or @EmbeddedId property.
Hope that helps and reduce your debugging effort.
