code: private Class<?> attemptFromContextLoader(final String driverClassName) {
        final ClassLoader threadContextClassLoader = Thread.currentThread().getContextClassLoader();
        if (threadContextClassLoader != null) {
           try {
              final Class<?> driverClass = threadContextClassLoader.loadClass(driverClassName);
              LOGGER.debug("Driver class {} found in Thread context class loader {}", driverClassName, threadContextClassLoader);
              return driverClass;
           } catch (ClassNotFoundException e) {
              LOGGER.debug("Driver class {} not found in Thread context class loader {}, trying classloader {}",
                 driverClassName, threadContextClassLoader, this.getClass().getClassLoader());
           }
        }
  
        return null;
     }
docs: ***********************************************************************