// Close and unregister the driver. protected static boolean destroyDriver(Driver driver) { if (driver != null) { assert (driver instanceof PhoenixTestDriver); PhoenixTestDriver pdriver = (PhoenixTestDriver) driver; try { try { pdriver.close(); return true; } finally { DriverManager.deregisterDriver(driver); } } catch (Exception e) { logger.warn("Unable to close registered driver: " + driver, e); } } return false; }