org.hibernate.AnnotationException: No identifier specified for entity - even when it was

I have the following configuration:

<bean id="entityManagerFactory"
		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="jpaDataSource" />
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
		</property>
		<property name="jpaProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
		<property name="packagesToScan">
        <list>
            <value>com.example.domain</value>
            <value>com.example.repositories</value>
        </list>
    </property>
</bean>

I have my Geoname class in com.example.domain:

@Entity
@Table(name="geonames")
public class Geoname implements Serializable {

	@Id
	@Column(name="geonameid")
	private Long geonameid = null;
}

yet, when running, I get the following exception:

> Caused by: org.hibernate.AnnotationException: No identifier specified > for entity: com.example.domain.Geoname at > org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:277) > at > org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:224) > at > org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:664) > at > org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3449) > at > org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3403) > at > org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1330) > at > org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1730)

Any ideas why?

side note: I am combining both mongodb and hibernate/ mysql on this project.

I had the following

import org.springframework.data.annotation.Id;

Naturally, it should be:

import javax.persistence.Id;

Thanks to @JB Nizet

I faced the same error.I solved it and figured out i didn't put @Id annotations in id field in my Entity class.

@Entity
@Table(name="geonames")
public class Geoname implements Serializable {

    @Column(name="geonameid")
    private Long geonameid = null;
}

try this

  @Column(name="geonameid",unique=true,nullable=false)