Spring Boot整合Nacos时遇到 java.lang.IllegalStateException: Context has been already given a name 的解决办法

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#Java #Spring Boot #Autowired #Exception #logback

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在SpringBoot项目中集成Alibaba Nacos时遇到日志框架Logback的冲突，导致启动时出现'Failed to rename context[logback]as[nacos]'的错误。该错误是由于Nacos自身集成的Logback与项目中原有的Logback冲突。解决方案是在启动类中设置系统属性'nacos.logging.default.config.enabled'为'false'，禁用Nacos自带的Logback配置，从而消除错误日志。

问题概述

在进行项目开发过程中，通过Spring Boot整合Alibaba Nacos的服务注册与发现和配置中心时，遇到个梗，启动时打印出一串错误日志信息 “ Failed to rename context [logback] as [nacos] java.lang.IllegalStateException: Context has been already given a name ” ，但是不会影响项目的正常运行和使用，

如下图：

具体错误信息如下：

2021-04-21 18:03:57.947 INFO [main]s.d.s.web.PropertySourcedRequestMappingHandlerMapping.initHandlerMethods:69 -Mapped URL path [/v2/api-docs] onto method [springfox.documentation.swagger2.web.Swagger2Controller#getDocumentation(String, HttpServletRequest)]
2021-04-21 18:03:57.982 INFO [main]o.s.scheduling.concurrent.ThreadPoolTaskExecutor.initialize:181 -Initializing ExecutorService 'applicationTaskExecutor'
2021-04-21 18:03:58.250 INFO [main]o.s.scheduling.concurrent.ThreadPoolTaskScheduler.initialize:181 -Initializing ExecutorService 'Nacso-Watch-Task-Scheduler'
18:03:58,258 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@748aa7dc - URL [jar:file:/D:/LOCAL_INSTALLER/apache-maven-3.6.3/.m2/repository/com/alibaba/nacos/nacos-client/1.1.4/nacos-client-1.1.4.jar!/nacos-logback.xml] is not of type file
18:03:58,259 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
18:03:58,259 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Will scan for changes in [jar:file:/D:/LOCAL_INSTALLER/apache-maven-3.6.3/.m2/repository/com/alibaba/nacos/nacos-client/1.1.4/nacos-client-1.1.4.jar!/nacos-logback.xml] 
18:03:58,259 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Setting ReconfigureOnChangeTask scanning period to 30 seconds
18:03:58,260 |-INFO in ch.qos.logback.classic.joran.action.ContextNameAction - Setting logger context name as [nacos]
18:03:58,260 |-ERROR in ch.qos.logback.classic.joran.action.ContextNameAction - Failed to rename context [logback] as [nacos] java.lang.IllegalStateException: Context has been already given a name
	at java.lang.IllegalStateException: Context has been already given a name
	at 	at ch.qos.logback.core.ContextBase.setName(ContextBase.java:194)
	at 	at ch.qos.logback.classic.LoggerContext.setName(LoggerContext.java:107)
	at 	at ch.qos.logback.classic.joran.action.ContextNameAction.body(ContextNameAction.java:31)
	at 	at ch.qos.logback.core.joran.spi.Interpreter.callBodyAction(Interpreter.java:289)
	at 	at ch.qos.logback.core.joran.spi.Interpreter.characters(Interpreter.java:172)
	at 	at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:57)
	at 	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:165)
	at 	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:152)
	at 	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
	at 	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)
	at 	at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
	at 	at com.alibaba.nacos.client.logging.logback.LogbackNacosLogging.loadConfiguration(LogbackNacosLogging.java:44)
	at 	at com.alibaba.nacos.client.utils.LogUtils.<clinit>(LogUtils.java:47)
	at 	at com.alibaba.nacos.client.naming.utils.InitUtils$1.call(InitUtils.java:56)
	at 	at com.alibaba.nacos.client.naming.utils.InitUtils$1.call(InitUtils.java:52)
	at 	at com.alibaba.nacos.client.utils.TemplateUtils.stringEmptyAndThenExecute(TemplateUtils.java:43)
	at 	at com.alibaba.nacos.client.naming.utils.InitUtils.initNamespaceForNaming(InitUtils.java:52)
	at 	at com.alibaba.nacos.client.naming.NacosNamingService.init(NacosNamingService.java:88)
	at 	at com.alibaba.nacos.client.naming.NacosNamingService.<init>(NacosNamingService.java:84)
	at 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at 	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at 	at com.alibaba.nacos.api.naming.NamingFactory.createNamingService(NamingFactory.java:45)
	at 	at com.alibaba.nacos.api.NacosFactory.createNamingService(NacosFactory.java:76)
	at 	at com.alibaba.cloud.nacos.NacosDiscoveryProperties.namingServiceInstance(NacosDiscoveryProperties.java:486)
	at 	at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.<init>(NacosServiceRegistry.java:47)
	at 	at com.alibaba.cloud.nacos.registry.NacosServiceRegistryAutoConfiguration.nacosServiceRegistry(NacosServiceRegistryAutoConfiguration.java:51)
	at 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at 	at java.lang.reflect.Method.invoke(Method.java:498)

解决办法

经过了一系列的烧脑摸索，一无所获，后，在官方文档上找到了相关问题的阐述（不是解决办法），然后再结合以往经验，终于把问题给解决了。

原来，在基于Spring Boot框架项目开发过程中，集成了Alibaba Nacos的服务注册与发现和配置中心，

因为Spring Boot本身已经集成了日志框架Logback，而在Alibaba Nacos中又集成了一套Logback框架（我顶你个肺，Alibaba Nacos给我们开发者们留了这么大一个坑），

而Alibaba Nacos中的Logback加载要优先于项目自身的Logback框架，在一个项目中其context_name只能定义一次，

所以，在项目启动时，Alibaba Nacos的Logback先加载完成后，再加载项目本身的Logback时就出现了冲突，报错误日志 “ Failed to rename context [logback] as [nacos] java.lang.IllegalStateException: Context has been already given a name ” ，但是不影响使用，

虽然不影响使用，但是作为一个传统的老码畜，看着这个错误日志，实在不爽，所以博主把它个消灭了，

解决这个，只要禁用掉其中一个Logback就可以了，一般禁用外部框架夹带的Logback即可，在启动类中加入如下段代码即可：


        System.setProperty("nacos.logging.default.config.enabled","false");

完整示例：

@EnableDiscoveryClient
@EnableFeignClients
@EnableSwagger2
@MapperScan({"com....*.mapper","com.....system.*.mapper","com.....*.mapper"})
@SpringBootApplication(scanBasePackages = {"com.....","com....."})
public class ApplicationName {

    public static void main(String[] args) {
        System.setProperty("nacos.logging.default.config.enabled","false");

        SpringApplication.run(ApplicationName.class, args);

    }

}

解决后就能成功启动了，如下图；

参考文献：

【alibaba-nacos】

好了，关于 Spring Boot整合Nacos时遇到java.lang.IllegalStateException: Context has been already given a name 的解决办法就写到这儿了，如果还有什么疑问或遇到什么问题欢迎扫码提问，也可以给我留言哦，我会一一详细的解答的。
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作者：	华仔
联系作者：	who.seek.me@java98k.vip
来源：	优快云 (Chinese Software Developer Network)
原文：	https://blog.youkuaiyun.com/Hello_World_QWP/article/details/117597111
版权声明：	本文为博主原创文章，请在转载时务必注明博文出处！