老师，请问后面这三个课程对面试重要吗？ 我要是做这个分布式医疗云项目，估计就没时间学这三个课程了

有md文档吗                                               

请问这个node.js要用什么版本啊，我用的16和18都是报错

zookeeper连接不成功，什么原因造成的？已经修改过超时连接的时间。

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-02-15 23:32:05.730 ERROR 15944 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: zookeeper not connected
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:83) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.<init>(ZookeeperRegistry.java:85) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:42) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:121) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.RegistryFactoryWrapper.getRegistry(RegistryFactoryWrapper.java:34) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.RegistryFactory$Adaptive.getRegistry(RegistryFactory$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.integration.RegistryProtocol.getRegistry(RegistryProtocol.java:298) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:204) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:60) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:64) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:143) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:470) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:315) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:287) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:205) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.lambda$exportServices$13(DubboBootstrap.java:873) ~[dubbo-2.7.5.jar:2.7.5]
    at java.base/java.util.HashMap$Values.forEach(HashMap.java:981) ~[na:na]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.exportServices(DubboBootstrap.java:861) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:703) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onContextRefreshedEvent(DubboBootstrapApplicationListener.java:52) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onApplicationContextEvent(DubboBootstrapApplicationListener.java:45) ~[dubbo-2.7.5.jar:2.7.5]
    at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40) ~[dubbo-2.7.5.jar:2.7.5]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:897) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at com.bjsxt.ErpApplication.main(ErpApplication.java:16) [classes/:na]
Caused by: java.lang.IllegalStateException: zookeeper not connected
    at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80) ~[dubbo-2.7.5.jar:2.7.5]
    ... 38 common frames omitted

老师，我把源缓存了淘宝镜像了，但是还是卡在这20分钟没变了

老师，这两个注解要连着用是吗？之前如果传的参数是一个类并且类的属性上面已经用@NotEmpty了所以只要写@Validated，而这边传来的仅是一个变量所以要两个一起用？

有点错误，正确的用户名和密码，也是显示错误！但好像不是登录这部分的代码的问题啊，好像数据库没连上？我看别人把那个响应时间和dubbo的版本都换了也试过，还是这个问题！

请问老师，这地方有点疑问，课程刚学到这，就已经使用1.7G了，如果再搞个Yapi会不会内存不够，或者后面学习中会出现内存不够的情况呢？

老师，mybatis plus课程有么？这个语法都没学呢

问一下，以后工作时后端程序员也得写这些前端的代码吗？还是说按接口文档只写后台呢？

老师，我的里面为什么没有settings.json这个

YAPI中接口文档怎么导入的啊，从天而降，莫名奇妙

老师好，请问这里的沙箱版支付宝跟工作中实际用的真实的支付宝接口差别大吗？

老师这个ProviderDto这个是实体类是怎么来的呀，我的mybatisgenerator生成都没有这个Dto的实体类。

我用的是idea2021.2.3