public @Nullable Class<?> getInterfaceClass() {
    try {
      return ApplicationManager.getApplication().loadClass(interfaceName, pluginDescriptor);
    }
    catch (ProcessCanceledException e) {
      throw e;
    }
    catch (Throwable e) {
      Logger.getInstance(DomImplementationClassEP.class).error(e);
      return null;
    }
  }
public @Nullable Class<?> getInterfaceClass()