nacos
好久没碰公司的uaa系统的，启动register中心时，nacos抛出异常：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'externalDumpService': Invocation of init method failed; nested exception is ErrCode:500, ErrMsg:Nacos Server did not start because dumpservice bean construction failure :No DataSource setat org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:160)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:422)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657)... 34 common frames omittedCaused by: com.alibaba.nacos.api.exception.NacosException: Nacos Server did not start because dumpservice bean construction failure :No DataSource setat com.alibaba.nacos.config.server.service.dump.DumpService.dumpOperate(DumpService.java:236)at com.alibaba.nacos.config.server.service.dump.ExternalDumpService.init(ExternalDumpService.java:52)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:389)at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:333)at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:157)... 46 common frames omittedCaused by: java.lang.IllegalStateException: No DataSource setat org.springframework.util.Assert.state(Assert.java:76)at org.springframework.jdbc.support.JdbcAccessor.obtainDataSource(JdbcAccessor.java:86)at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:376)at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:465)at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:475)at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:508)at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:515)at com.alibaba.nacos.config.server.service.repository.extrnal.ExternalStoragePersistServiceImpl.findConfigMaxId(ExternalStoragePersistServiceImpl.java:658)at com.alibaba.nacos.config.server.service.dump.processor.DumpAllProcessor.process(DumpAllProcessor.java:51)at com.alibaba.nacos.config.server.service.dump.DumpService.dumpConfigInfo(DumpService.java:293)at com.alibaba.nacos.config.server.service.dump.DumpService.dumpOperate(DumpService.java:205)... 54 common frames omitted经排查和测试发现是因为没有设置nacos的mysql连接，数据库的ip、数据库、用户名和密码都错了。
改正确之后就可以成功了。
nacos-nacos启动失败(Nacos Server did not start because dumpservice bean construction