EntityTransaction rollback - jpa

Question

I use EJB to insert/update data to the database and I have this problem. My commit only works with updating(merge), but doesn't rollback inserts(persist). Even more, my inserts(persist) happen before transaction commit.
my persistence unit:
<persistence-unit name="bpmBeans_RESOURCE_LOCAL" transaction-type="RESOURCE_LOCAL">
<jta-data-source>java:jboss/datasources/java_orgstruct</jta-data-source>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.useUnicode" value="true"/>
<property name="hibernate.connection.characterEncoding" value="UTF-8"/>
<property name="hibernate.connection.CharSet" value="utf8"/>
<property name="hibernate.cache.use_second_level_cache" value="true" />
<property name="hibernate.cache.use_query_cache" value="true" />
<property name="hibernate.transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory" />
<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
<property name="hibernate.connection.autocommit" value="false"/>
</properties>
</persistence-unit>
how i inject entity manager factory
#PersistenceUnit(unitName="bpmBeans_RESOURCE_LOCAL")
public EntityManagerFactory emf;
what happens with the code
EntityManager em = emf.createEntityManager();
EntityTransaction ets = em.getTransaction();
ets.begin();
Process newObj = new Process();
em.persist(newObj); //data gets inserted at this moment, not at commit
...
...
if(allgood){
ets.commit();// now update(merge, setters on managed entities) would happend.
} else {
ets.rollback(); // this would rollback the updates, but not the insert
}
Any ideas what to try? I guess I'm just understanding some JPA concepts badly.
EDIT:
Datasource code. Datasource is described in WEB-INF/mysql-ds.xml file . Driver .jar is in JBoss deployments.
<?xml version="1.0" encoding="UTF-8"?>
<datasources xmlns="http://www.jboss.org/ironjacamar/schema">
<datasource jndi-name="java:jboss/datasources/java_orgstruct" pool-name="MySQLPool">
<connection-url>jdbc:mysql://192.168.150.141/organisation_model</connection-url>
<connection-property name="zeroDateTimeBehavior">convertToNull</connection-property>
<connection-property name="characterEncoding">utf8</connection-property>
<driver>mysql-connector-java-5.1.28-bin.jar</driver>
<security>
<user-name></user-name>
<password></password>
</security>
</datasource>
</datasources>