No bean named 'transactionManager' is defined

Salut ,

J'ai rencontré ce erreur et je n'ai pas pu le résoudre :
factory.BeanCreationException: Error creating bean with name 'initDbService' caused by NoSuchBeanDefinitionException: No bean named 'transactionManager' is defined .

Mais j'ai bien definie dans le fichier ApplicationContext.xml.
Le fichier InitDbService

Code:

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@Transactional
@Service
public class InitDbService {
 
	@Autowired
	private RoleRepository roleRepository ;
 
	@Autowired 
	private UserRepository userRepository ;
 
	@Autowired
	private ItemRepository itemRepository ;
 
	@Autowired
	private BlogRepository blogRepository ;
 
	@PostConstruct
	public void init()
	{
		Role roleUser = new Role();
		roleUser.setName("ROLE_USER");
		roleRepository.save(roleUser);
 
		Role roleAdmin = new Role();
		roleAdmin.setName("ROLE_ADMIN");
		roleRepository.save(roleAdmin);
 
		User userAdmin = new User();
		userAdmin.setName("admin");
		List<Role> roles = new ArrayList<Role>();
		roles.add(roleUser);
		roles.add(roleAdmin);
		userAdmin.setRoles(roles);
		userRepository.save(userAdmin);
 
		Blog blogJavaVids = new Blog();
		blogJavaVids.setName("JavaVids");
		blogJavaVids.setUrl("http://feeds.feedburner.com/javavids?format=xml");
		blogJavaVids.setUser(userAdmin);
		blogRepository.save(blogJavaVids);
 
		Item item1 = new Item();
		item1.setBlog(blogJavaVids);
		item1.setTitle("first");
		item1.setLink("http://www.javavids.com");
		item1.setPublishedDate(new Date());
		itemRepository.save(item1);
 
		Item item2 = new Item();
		item2.setBlog(blogJavaVids);
		item2.setTitle("second");
		item2.setLink("http://www.javavids.com");
		item2.setPublishedDate(new Date());
		itemRepository.save(item2);
	}
 
 
}

et le fichier applicationContext.xml ou j'ai defenie le bean transactionManger

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	<context:component-scan base-package="cz.jiripinkas.jba" >
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>
 
	<tx:annotation-driven transaction-manager="transactionManager"/>
 
	<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManger">
		<property name="dataSource" ref="dataSource" />
	</bean>
 
	<jpa:repositories base-package="cz.jiripinkas.jba.repository" />
 
	<jdbc:embedded-database type="HSQL" id="dataSource" />
 
	<bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="emf">
		<property name="packagesToScan" value="cz.jiripinkas.jba.entity" />
		<property name="dataSource"  ref="dataSource" />
		<property name="jpaProperties">
			<props>
				<prop key="hibernate.show_sql"> true</prop>
				<prop key="hibernate.hbm2ddl.auto"> create</prop>
			</props>
		</property>
		<property name="persistenceProvider">
			<bean class="org.hibernate.jpa.HibernatePersistenceProvider" />
		</property>
 
	</bean>
 
	<jpa:repositories base-package="cz.jiripinkas.jba.repository"  entity-manager-factory-ref="emf" 
		transaction-manager-ref="transactionManager" />
 
</beans>

Merci.