ERROR Context initialization failed at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:215)
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManager' defined in class path resource [META-INF/jpaContext.xml]: Invocation of init method failed; nested exception is java.lang.LinkageError: loader constraint violation: loader (instance of org/jboss/web/tomcat/service/WebCtxLoader$ENCLoader) previously initiated loading for a different type with name "javax/persistence/LockModeType"

<jee:jndi-lookup id="dataSource" jndi-name="java:jdbc/sigmaFaDataSource"/>

  <!-- JPA EntityManagerFactory -->
  <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter">
        <property name="databasePlatform" value="org.eclipse.persistence.platform.database.oracle.Oracle9Platform"/>
        <property name="showSql" value="true"/>
      </bean>
    </property>
    <property name="jpaProperties">
      <props>
        <prop key="eclipselink.target-server">org.eclipse.persistence.platform.server.jboss.JBossPlatform</prop>
        <prop key="eclipselink.logging.level">ALL</prop>
        <prop key="eclipselink.logging.logger">com.foo.SLF4JSessionLogger</prop>
        <prop key="eclipselink.logging.timestamp">false</prop>
        <prop key="eclipselink.logging.thread">false</prop>
        <prop key="eclipselink.logging.session">false</prop>
        <prop key="eclipselink.jdbc.native-sql">true</prop>
        <prop key="eclipselink.jdbc.cache-statements">false</prop>
        <prop key="eclipselink.weaving">false</prop>
        <prop key="eclipselink.ddl-generation">none</prop>
      </props>
    </property>
    <property name="persistenceXmlLocation" value="${persistence.xml.location}" />
  </bean>

  <bean id="entityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
  </bean>

  <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
    <property name="transactionManagerName" value="java:/TransactionManager"/>
  </bean>

  <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
  
  <tx:annotation-driven mode="proxy"/>