public static <T> T newInstance(String klass, Class<T> base) throws ClassNotFoundException {
        return Utils.newInstance(loadClass(klass, base));
    }
Look up the class by name and instantiate it.
@param klass class name
@param base super class of the class to be instantiated
@param <T> the type of the base class
@return the new instance
clients/src/main/java/org/apache/kafka/common/utils/Utils.java