BeanCreationException: Could not autowire field: javax.persistence.EntityManagerFactory

Bonjour,

J'ai un problème lors du déploiement de mon war sur un serveur Websphere v6.1. Le même war est déployé avec succès sur un serveur Tomcat. Voici l'erreur que j'obtiens au démarrage du serveur.

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: javax.persistence.EntityManagerFactory com.aon.globe.survey.server.dao.CategoryDAO.entityManagerFactory; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:507)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:283)
... 30 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1403)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:825)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:767)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:685)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:478)
... 32 more
Caused by: java.lang.NullPointerException
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:169)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2833)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2829)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:902)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:57)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
at org.springframework.orm.jpa.LocalEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalEntityManagerFactoryBean.java:92)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:308)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1460)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1400)
... 42 more

Mon ficher applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="
http://www.springframework.org/schema/aop http://www.springframework.org/schem...ng-aop-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schem...-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schem...ontext-3.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schem...ng-jee-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schem...ing-tx-3.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd">

<context:component-scan base-package="com.aon.globe.survey" />

<task:annotation-driven executor="myExecutor" scheduler="myScheduler" />

<task:executor id="myExecutor" pool-size="5" />

<task:scheduler id="myScheduler" pool-size="10" />

<tx:annotation-driven />

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="MyPersistenceUnitName" />
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

</beans>

et le fichier persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">

<persistence-unit name="MyPersistenceUnitName" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>

<properties>

<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
<property name="hibernate.connection.url" value="jdbc:oracle:thin:@IP:PORT:INSTANCE" />

<property name="hibernate.connection.username" value="user" />
<property name="hibernate.connection.password" value="pass" />


<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.connection.pool_size" value="6" />
<property name="hibernate.connection.autoReconnect" value="true" />
<property name="hibernate.generate_statistics" value="false" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.use_sql_comments" value="false" />

<property name="hibernate.cache.use_second_level_cache" value="false" />
</properties>

</persistence-unit>

</persistence>

Celà fait plusieurs jours que je cherche et je n'ai aucune idée d'ou peut provenir le probleme, étant donné que je n'ai pas la main sur le serveur Websphere (Production). Si vous souhaitez plus d'informations, n'hesitez pas...
Merci d'avance