Dynamic EntityManager & EntityManagerFactory & Oracle wallet

public JPAUtil(String config) throws Exception {

      Class.forName("oracle.jdbc.OracleDriver");
       String url = "jdbc:oracle:oci:/@" + config;
       Map properties = new HashMap();
       // Mixed versions of Eclipselink require different versions of params.
       properties.put(PersistenceUnitProperties.JDBC_DRIVER, "oracle.jdbc.OracleDriver");
       properties.put("eclipselink.jdbc.driver", "oracle.jdbc.OracleDriver");
       properties.put(PersistenceUnitProperties.JDBC_URL, url);
       properties.put("eclipselink.jdbc.url", url);

       // Remark that we had to specify the parameters twice.
       // Newer versions of Eclipselink are standardize on parameters like in javax.persistence.xxxx
       // older versions require parameters as eclipselink.jdbc.url

       properties.put(PersistenceUnitProperties.JDBC_USER, "");
       System.out.println(PersistenceUnitProperties.JDBC_URL);
       properties .put(PersistenceUnitProperties.JDBC_READ_CONNECTIONS_MIN, "1");
       properties.put(PersistenceUnitProperties.JDBC_WRITE_CONNECTIONS_MIN, "1");
       properties.put(PersistenceUnitProperties.LOGGING_LEVEL, "OFF");
       properties.put(PersistenceUnitProperties.TARGET_DATABASE, "Oracle");
       properties.put(PersistenceUnitProperties.TARGET_SERVER, "NONE");
       properties.put(PersistenceUnitProperties.WEAVING, "static");
       emf = Persistence.createEntityManagerFactory("DSLocalDynamic", properties);
       if (emf.isOpen()) {
           System.out.println("emf is open");
           Map props2 = new HashMap();
           props2.put(PersistenceUnitProperties.SESSION_NAME, "monimir");
           props2.put(PersistenceUnitProperties.JDBC_DRIVER, "oracle.jdbc.OracleDriver");
           props2.put(PersistenceUnitProperties.TRANSACTION_TYPE, "RESOURCE_LOCAL");
           // to override data source if one is specified in persistence.xml
           props2.put(PersistenceUnitProperties.JTA_DATASOURCE, ""); 
           // to override data source if one is specified in persistence.xml
           props2.put(PersistenceUnitProperties.JDBC_URL, url);
           props2.put(PersistenceUnitProperties.JDBC_USER, "");
           props2.put( PersistenceUnitProperties.JDBC_READ_CONNECTIONS_MIN, "1");
           props2.put( PersistenceUnitProperties.JDBC_WRITE_CONNECTIONS_MIN, "1");
           props2.put(PersistenceUnitProperties.LOGGING_LEVEL, "FINE");
           props2 .put(PersistenceUnitProperties.TARGET_DATABASE, "Oracle");
           props2.put(PersistenceUnitProperties.TARGET_SERVER, "NONE");
           props2.put(PersistenceUnitProperties.WEAVING, "static");
           EntityManager em = emf.createEntityManager(props2);
           if (em.isOpen()) {
              em.close(); }
           } else {
                System.out.println("em is not open"); }
           }