Using JPA 2 with Hibernate 4.1.0 as provider in WildFly. Hibernate 410 jars defined inside the application classpath (EAR). This is Spring based web application and the entityManager is autowired by Spring container.

The same setup works in Jboss 711 and below is the error, persistence.xml & datasource definition

Error:
======
014-04-10 19:17:34 [ERROR] [stderr:71] java.lang.NullPointerException

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118)

please refer to https://community.jboss.org/message/867851?et=watches.email.thread#867851 for more details

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:313)

2014-04-10 19:17:34 [ERROR] [stderr:71] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

2014-04-10 19:17:34 [ERROR] [stderr:71] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

2014-04-10 19:17:34 [ERROR] [stderr:71] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

2014-04-10 19:17:34 [ERROR] [stderr:71] at java.lang.reflect.Method.invoke(Method.java:606)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.invokeProxyMethod(AbstractEntityManagerFactoryBean.java:376)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean$ManagedEntityManagerFactoryInvocationHandler.invoke(AbstractEntityManagerFactoryBean.java:517)

2014-04-10 19:17:34 [ERROR] [stderr:71] at com.sun.proxy.$Proxy76.createEntityManager(Unknown Source)

2014-04-10 19:17:34 [ERROR] [stderr:71] at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:234)

2014-04-10 19:17:34 [ERROR] [stderr:71] at com.sun.proxy.$Proxy77.createQuery(Unknown Source)

Persistence.xml
==============

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
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_1_0.xsd">

<persistence-unit name="CPSPersistenceUnit" transaction-type="JTA">

<provider>org.hibernate.ejb.HibernatePersistence</provider> <!-- tried with org.hibernate.jpa.HibernatePersistenceProvider as well but no luck -->

<jta-data-source>java:jboss/jdbc/CPSDatabase</jta-data-source>

<class..>

<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.show_sql" value="true" />

<property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup" />

<property name="jta.UserTransaction" value="java:comp/UserTransaction" />

</properties>

</persistence-unit>
</persistence>

--------------------------------------------------------------------------------

<datasource jta="true" jndi-name="java:jboss/jdbc/CPSDatabase" pool-name="CPSDatabase" enabled="true" use-ccm="false">

<connection-url>myurl</connection-url>

<driver-class>oracle.jdbc.OracleDriver</driver-class>

<driver>OracleJDBCDriver</driver>

<security>

<user-name>user</user-name>

<password>pass</password>

</security>

<validation>

<validate-on-match>false</validate-on-match>

<background-validation>false</background-validation>

</validation>

<statement>

<share-prepared-statements>false</share-prepared-statements>

</statement>

</datasource>