1.错误：
com.alibaba.nacos.api.exception.NacosException: failed to req API:/nacos/v1/ns/instance after all servers([localhost:8848]) tried: ErrCode:403, ErrMsg:<html><body><h1>Whitelabel Error Page</h1><p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p><div id='created'>Sat Jun 10 15:35:54 GMT+08:00 2023</div><div>There was an unexpected error (type=Forbidden, status=403).</div><div>user not found!</div></body></html>
at com.alibaba.nacos.client.naming.net.NamingProxy.reqApi(NamingProxy.java:556) ~[nacos-client-1.4.1.jar:na]
at com.alibaba.nacos.client.naming.net.NamingProxy.reqApi(NamingProxy.java:498) ~[nacos-client-1.4.1.jar:na]
at com.alibaba.nacos.client.naming.net.NamingProxy.reqApi(NamingProxy.java:493) ~[nacos-client-1.4.1.jar:na]
at com.alibaba.nacos.client.naming.net.NamingProxy.registerService(NamingProxy.java:246) ~[nacos-client-1.4.1.jar:na]
at com.alibaba.nacos.client.naming.NacosNamingService.registerInstance(NacosNamingService.java:212) ~[nacos-client-1.4.1.jar:na]
at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.register(NacosServiceRegistry.java:74) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.1.jar:2021.1]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.register(AbstractAutoServiceRegistration.java:232) [spring-cloud-commons-3.1.3.jar:3.1.3]
at com.alibaba.cloud.nacos.registry.NacosAutoServiceRegistration.register(NacosAutoServiceRegistration.java:78) [spring-cloud-starter-alibaba-nacos-discovery-2021.1.jar:2021.1]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.start(AbstractAutoServiceRegistration.java:133) [spring-cloud-commons-3.1.3.jar:3.1.3]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.bind(AbstractAutoServiceRegistration.java:98) [spring-cloud-commons-3.1.3.jar:3.1.3]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.onApplicationEvent(AbstractAutoServiceRegistration.java:86) [spring-cloud-commons-3.1.3.jar:3.1.3]
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.onApplicationEvent(AbstractAutoServiceRegistration.java:47) [spring-cloud-commons-3.1.3.jar:3.1.3]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:421) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:378) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:46) [spring-boot-2.7.6.jar:2.7.6]
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) [spring-context-5.3.24.jar:5.3.24]
at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_361]
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) [spring-context-5.3.24.jar:5.3.24]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.6.jar:2.7.6]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) ~[spring-boot-2.7.6.jar:2.7.6]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.6.jar:2.7.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.7.6.jar:2.7.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.7.6.jar:2.7.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.7.6.jar:2.7.6]
at com.lht.user.UserApplication.main(UserApplication.java:11) ~[classes/:na]
2. 问题摘要
failed to req API:/nacos/v1/ns/instance after all servers([localhost:8848]) tried: ErrCode:403, ErrMsg:<html><body><h1>Whitelabel Error Page</h1><p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p><div id='created'>Sat Jun 10 15:35:54 GMT+08:00 2023</div><div>There was an unexpected error (type=Forbidden, status=403).</div><div>user not found!</div></body></html> 提示找不到用户
3. 分析问题：
nacos配置文件中配置如下
nacos.core.auth.server.identity.key=nacos
nacos.core.auth.server.identity.value=nacosapplication.yml中配置如下
cloud:
nacos:
discovery:
server-addr: localhost:8848
文件中已经配置用户名密码，而在spring配置文件中国 未配置文章来源：https://www.toymoban.com/news/detail-567546.html
4.解决方法：添加配置
cloud:
nacos:
discovery:
server-addr: localhost:8848
username: nacos
password: nacos问题解决文章来源地址https://www.toymoban.com/news/detail-567546.html
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