MLet mlet = new MLet();
        ObjectName mletObject = new ObjectName(ServiceName.DOMAIN, "service",
                                               "MLet");
        ObjectInstance moduleInstance = mbServerConnection.createMBean(mlet.
                getClass().getName(), mletObject);
        Object[] param = {new File(
                       "services.conf").toURL())};
        Boolean beans =(Boolean) mbServerConnection.invoke(mletObject,
                "getMBeansFromURL", //函数名
                param , //无参数
                null //无签名    );
                抛出getMBeansFromURL notfound异常,why?