code: @Override
      public Properties getProperties() {
          Properties properties = new Properties();
          if (persistenceUnitXml.getProperties() != null && persistenceUnitXml.getProperties().getProperty() != null) {
              for (Persistence.PersistenceUnit.Properties.Property p : persistenceUnitXml.getProperties().getProperty()) {
                  properties.put(p.getName(), p.getValue());
              }
          }
          return properties;
      }
docs: /*
  @see javax.persistence.spi.PersistenceUnitInfo#getProperties()