providers.remove(className);
FontProvider prv = providers.remove(className); if(firstProvider == prv) { firstProvider = null;   }
    public void extensionRemoved(ExtensionPoint point, Extension extension) {        final ConfigurationElement[] elements = extension.getConfigurationElements();        for (int j = 0; j < elements.length; j++) {            final String className = elements[j].getAttribute("class");            log.debug("Removed provider: class=" + className);            if (className != null) {                providers.remove(className);            }        }    }