After upgrading JPA from 3.6.1 to 4.1.8 I start getting the following error:

"Error: registry contains more than one (2) entity manager factories: PERSISTENCE_UNIT_NAME"

Below you can find a brief summary of our specification requirements.

- User logins in the web application using their own oracle database account.
- The web application only needs to access one database schema;
- The access rights are managed using oracle roles and grant privilegies.
- Only one database schema and multiple user oracle accounts.
- We only set the username and password when users tries to login in the web application.
- The EntityManagerFactory is created using the username and password of the user.

- Because our web application only access one database we only use one persistence unit name.

E.g. 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="PERSISTENCE_UNIT_NAME">
<provider>org.hibernate.ejb.HibernatePersistence</provider>

<properties>
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver">
<property name="hibernate.connection.url" value="jdbc:oracle:xx...">
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect">
<property name="hibernate.default_schema" value="SCHEMA_NAME">

<property name="hibernate.connection.username" value="USERNAME">
<property name="hibernate.connection.password" value="PASSWORD">

<property name="hibernate.connection.autocommit" value="false">
<property name="hbm2ddl.auto" value="validate">

<property name="hibernate.show_sql" value="true">
<property name="hibernate.format_sql" value="true">
</properties>
</persistence-unit>
</persistence>


E.g. how we create and close the entity manager factory

Map<String, String> configuration = new ProviderConfiguration();
configuration.put("hibernate.connection.username", username);
configuration.put("hibernate.connection.password", password);
EntityManagerFactory emf = Persistence.createEntityManagerFactory("PERSISTENCE_UNIT_NAME", configuration);
EntityManager em = emf.createEntityManager();
SptrTaxNode t = em.find(SptrTaxNode.class, 9606);
em.close();
emf.close();

Does anyone ever had a similar situation? Any ideas on how can I solve this problem?

Thanks in advance