可能原因一: 集群切换单机
startup -m standalone 
可能原因二: derby-data文件夹内文件解析失败
解决方案: 删了derby-data文件夹重启就行
报错信息(供网友搜索):
2021-08-11 13:11:37,550 WARN Exception encountered during context 
initialization - cancelling refresh attempt: 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'webSecurityConfig': Unsatisfied dependency expressed 
through field 'userDetailsService'; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'customUserDetailsServiceImpl': Unsatisfied dependency 
expressed through field 'persistService'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'persistService': Invocation of init method failed; nested exception 
is org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'localDataSourceService': Invocation of init method failed; nested 
exception is java.lang.RuntimeException: load schema.sql 
error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) WARNING: An illegal reflective access operation has 
occurred WARNING: Illegal reflective access by 
org.apache.catalina.loader.WebappClassLoaderBase 
(jar:file:/E:/nacos/target/nacos-server.jar!/BOOT-INF/lib/tomcat-embed-core-9.0.13.jar!/) 
to field java.io.ObjectStreamClass$Caches.localDescs WARNING: Please consider 
reporting this to the maintainers of 
org.apache.catalina.loader.WebappClassLoaderBase WARNING: Use 
--illegal-access=warn to enable warnings of further illegal reflective access 
operations WARNING: All illegal access operations will be denied in a future 
release 2021-08-11 13:11:37,591 INFO Nacos Log files: E:\nacos/logs/ 2021-08-11 
13:11:37,591 INFO Nacos Conf files: E:\nacos/conf/ 2021-08-11 13:11:37,592 INFO 
Nacos Data files: E:\nacos/data/ 2021-08-11 13:11:37,592 ERROR Nacos failed to 
start, please see E:\nacos/logs/nacos.log for more details. 2021-08-11 
13:11:37,599 INFO Error starting ApplicationContext. To display the conditions 
report re-run your application with 'debug' enabled. 2021-08-11 13:11:37,600 
ERROR Application run failed 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'webSecurityConfig': Unsatisfied dependency expressed 
through field 'userDetailsService'; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'customUserDetailsServiceImpl': Unsatisfied dependency 
expressed through field 'persistService'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'persistService': Invocation of init method failed; nested exception 
is org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'localDataSourceService': Invocation of init method failed; nested 
exception is java.lang.RuntimeException: load schema.sql 
error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) 
at 
org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) 
at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) 
at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) 
at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) 
at 
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) 
at 
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 
at 
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) 
at 
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) 
at 
org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) 
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) 
at com.alibaba.nacos.Nacos.main(Nacos.java:33) 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.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) 
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) at 
org.springframework.boot.loader.Launcher.launch(Launcher.java:50) at 
org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:593) 
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'customUserDetailsServiceImpl': Unsatisfied 
dependency expressed through field 'persistService'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'persistService': Invocation of init method failed; nested exception 
is org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'localDataSourceService': Invocation of init method failed; nested 
exception is java.lang.RuntimeException: load schema.sql 
error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) 
at 
org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) 
at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) 
at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) 
at 
org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273) 
at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1237) 
at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1164) 
at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) 
... 27 common frames omitted Caused by: 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'persistService': Invocation of init method failed; nested exception 
is org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'localDataSourceService': Invocation of init method failed; nested 
exception is java.lang.RuntimeException: load schema.sql 
error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:419) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1737) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) 
at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) 
at 
org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273) 
at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1237) 
at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1164) 
at 
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) 
... 40 common frames omitted Caused by: 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'localDataSourceService': Invocation of init method failed; nested 
exception is java.lang.RuntimeException: load schema.sql 
error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:419) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1737) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) 
at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) 
at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) 
at 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) 
at 
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083) 
at 
com.alibaba.nacos.config.server.service.DynamicDataSource.getDataSource(DynamicDataSource.java:52) 
at 
com.alibaba.nacos.config.server.service.PersistService.init(PersistService.java:91) 
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.base/java.lang.reflect.Method.invoke(Method.java:566) at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363) 
at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307) 
at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136) 
... 52 common frames omitted Caused by: java.lang.RuntimeException: load 
schema.sql error.org.apache.commons.dbcp.SQLNestedException: Cannot create 
PoolableConnectionFactory (Failed to start database 'E:\nacos\data\derby-data' 
with class loader 
org.springframework.boot.loader.LaunchedURLClassLoader@59f99ea, see the next 
exception for details.) at 
com.alibaba.nacos.config.server.service.LocalDataSourceServiceImpl.reload(LocalDataSourceServiceImpl.java:110) 
at 
com.alibaba.nacos.config.server.service.LocalDataSourceServiceImpl.init(LocalDataSourceServiceImpl.java:94) 
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.base/java.lang.reflect.Method.invoke(Method.java:566) at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363) 
at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307) 
at 
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136) 
... 70 common frames omitted