Ehcache element <cache/> does not allow attribute "transactionalMode"?

Question

According to the Ehcache documentation, starting with version 2.0, an Ehcache cache may participate in a JTA transaction based on the value of attribute transactionalMode on element <cache/>.

If this is true, then why does Ehcache, when it encounters this attribute in my Ehcache configuration file, throw the following exception and complain that "Element does not allow attribute "transactionalMode".":

Caused by: net.sf.ehcache.CacheException: Error configuring from zip:C:/Program Files/Oracle/Middleware/user_projects/domains/abstrack1/servers/AdminServer/tmp/_WL_user/_appsdir_middleware-ear-1.0-SNAPSHOT_ear/n8rga7/middleware-ejb-1.0-SNAPSHOT.jar!/ehcache.xml. Initial cause was Error configuring from input stream. Initial cause was null:35: Element <cache> does not allow attribute "transactionalMode".
    at net.sf.ehcache.config.ConfigurationFactory.parseConfiguration(ConfigurationFactory.java:95)
    at net.sf.ehcache.config.ConfigurationFactory.parseConfiguration(ConfigurationFactory.java:131)
    at net.sf.ehcache.CacheManager.parseConfiguration(CacheManager.java:241)
    at net.sf.ehcache.CacheManager.init(CacheManager.java:190)
    at net.sf.ehcache.CacheManager.<init>(CacheManager.java:183)
    at net.sf.ehcache.hibernate.EhCacheProvider.start(EhCacheProvider.java:128)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:183)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:814)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:732)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
    ... 76 more]]>

Here is a sample cache definition from my ehcache.xml file in which I've set transactionalMode to "xa":

<cache
    name="com.db.spgit.abstrack.model.Security"
    maxElementsInMemory="500"
    eternal="false"
    timeToIdleSeconds="300"
    timeToLiveSeconds="86400"
    overflowToDisk="false"
    transactionalMode="xa" />

Answer 1

Turns out that Maven had also included Ehcache 1.2.3 in my project EAR file because Hibernate Ehcache Integration 3.3.2.GA requires Ehcache 1.2.3.