Issue

• NullPointerException when Spring attempts to start a transaction

java.lang.NullPointerException
    at org.hibernate.engine.transaction.internal.jta.JtaTransaction.getJoinStatus(JtaTransaction.java:274)
    at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.attemptToRegisterJtaSync(TransactionCoordinatorImpl.java:222)
    ...
    at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:174)
    at org.springframework.orm.jpa.JpaTransactionManager.createEntityManagerForTransaction(JpaTransactionManager.java:400)
    at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:321)
    ...

• Hibernate configuration was created as below

...
    <persistence-unit name="MyPersistenceUnit" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:jboss/datasources/MyDS</jta-data-source>
        ...
        <properties>
            ...
            <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossStandaloneJtaPlatform" />
            <property name="hibernate.transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory"/>
        </properties>
    </persistence-unit>
...