throw new NoClassDefFoundError(klass_name);
NoClassDefFoundError ncdfe = new NoClassDefFoundError(klass_name); ncdfe.initCause(x); throw ncdfe;
  public void run()  {    if (is_jar)      klass_name = getMain(klass_name);    if (klass == null)      {        try	  {	    klass = Class.forName(klass_name);	  }	catch (ClassNotFoundException x)	  {	    throw new NoClassDefFoundError(klass_name);	  }      }    call_main();  }